I keep breaking the needle because when the presser foot is down it hits the plate on the bottom of the machine

Sounds like the needle bar has been knoceked out of adjustment. Take it for service. It will never work in its current condition and is dangerous should the needle break and hit you in the face,

If the needle is hitting something, make sure you have the machine set for straight stitch and the needle is in the center position. If it is still hitting and breaking, then the machine is out of adjustment and needs to be repaired.

If your machine has multiple needle positions, make sure the needle is set in the center position. Also, make sure you are using a zig-zag presser foot where the opening is wide enough to accommodate an off-center needle or to make decorative stitching. If you are using a straight-stitch foot, then the foot will have only a small circular hole in the center and the machine must be set for straight-stitch only.

It the needle still hits, then the needle bar may be off-kilter. Take it for service.

Look at the Different Types of Sewing Machine Feet

Just guessing here. Is the needle hitting the presser foot? If so, it could be the wrong presser foot for your machine (especially if it is not attaching properly), could be the wrong needle for the machine or is installed incorrectly, could be the needle bar is not centered, or the needle position setting could be off to one side or the other rather than in the middle. Hard to diagnose without more information.

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Check to be sure you are using needles and thread that are compatible with the fabric. Generally, finer threads will work better on fine fabrics along with a smaller needle. Be sure to change needles frequently as dull, bent, or nicked needles will cause very frustrating issues.
All About Needles

Remove the thread completely from the machine. RAISE the presser foot and rethread from the beginning, making sure the thread path is correct.

Some machines have a presser foot pressure adjustment (consult the owner's manual). Adjusting the pressure that the presser foot applies to the fabric & feed dogs is helpful when sewing especially fine or heavy fabric. Also, when sewing fine fabrics, loosening the tension could be beneficial.

Changing presser feet may also help, ie try using a straight stitch foot vs a presser foot for zig-zag stitching.

Something else you can try is finding a presser foot with a teflon finish or a roller foot that will glide or roll with the fabric through the machine. Even if you can't find a brand name presser foot for your particular machine, an adapter shank can probably be found that would allow you to use snap-on feet of all different designs and uses. Provides a lot of choices for presser feet for less than purchasing a brand-name presser foot. There are snap-on kits available on eBay and other auction sites.

Some machines also can take a straight-stitch needle plate--usually an additional accessory that can be purchased. The hole where the needle penetrates the needle plate to access the bobbin thread is actually a small round hole. With a zig-zag needle plate, the hole the needle penetrates is a wide rectangular hole that can allow fine fabrics to be pulled down through the hole. Zig-zag capable machines usually have a zig-zag needle plate as standard.

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ck the alignment of the foot plate (under presser foot) if needle rubs this plate it will break every time

First, you will need to select a brand new needle of the type suitable for your fabric. Select a proper thread weight and type for your needle and fabric.

Select the proper presser foot for your project/fabric. On some fabrics, you may even want to use a straight stitch needle plate to prevent the fabric from going down the needle hole.

You will want to adjust the upper tension so that the upper and bobbin threads meet in the middle of the fabric.

Also, probably want to adjust the presser foot pressure so that the presser foot presses harder or lighter (depending on the fabric) so the fabric will feed through evenly, ie both the top and bottom fabrics move together at the same rate. Hint: if it is really thick, like sewing a quilt with batting, a walking foot may be helpful.

Be sure to test on scrap fabric from your project before beginning sewing your project together.

All About Needles

Why is there an extra needle plate supplied with my machine Brother straight stitch plate and presser foot cannot be used with zig-zag or decorative stitch or you will surely break your needle and possible knock the machine out of time!

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwib0Z_YrrbJAhUBUGMKHc6OBhAQFggeMAA&url=http%3A%2F%2Fwww.ca.uky.edu%2FHES%2Ffcs%2FFACTSHTS%2FCT-MMB-213.pdf&usg=AFQjCNE4QlGk1Fvt8K2UGCRCfzMpGS-A2Q&cad=rja adjusting tension

Adjusting Sewing Machine Tension to Prevent Problems

http://makeitsew.biz/presser-foot-pressure

Adjusting the presser foot pressure on your sewing machine

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Is the needle all the way up? Are you sure it's actually hitting the bobbin? It MAY--and quite possibly IS--inserted too low in the needle clamp. Make absolutely sure that it's all the way up. Another factor can be your foot--make sure that it's properly inserted and tight, because it's probably hitting the foot and breaking--not the bobbin. In addition, it could be hitting the needle plate. You can determine WHERE it's breaking by manually turning the hand wheel--ALWAYS towards you--several times to see the position of your needle relative to the foot and needle plate.

check to see if the presser foot is loose
check to see if the needle is in backwards
if the presser foot is tight & needle is not in backwards then it could be a timming problem, since you said the needle is hitting the presser foot
please rate this with the thumbs in upper right hand corner

You need to use the zig zag or satin stitch presser foot with the twin needle. You also need to make sure you have the zig zag plate on your machine. Also, remember when using the twin needle, you cannot put your stitch width beyond half way. The best thing to do is once you select the width, turn the handwheel to see where the needle is going to hit, you want to make sure it clears the plate or it will break.