How to fix headphone jack on a toshiba satellite pro l450d-12x laptop ill play music out load on the laptop speakers and ill be able to hear the sound , but as soon as i plug my headphones into the jak port the song im listening to will carry on playing but no sound will come out off my headphones

In my experience, you have to open up the laptop and see if the stereo jack can be seen openly or if it is enclosed in a solid plastic block.
If it is open, you can usually bend the leads back into place where the negative will get in better contact and make the connection to the headphone.
It it is enclosed, you'll have to remove and replace it with a little soldering of a few small connections to the motherboard. You can find a replacement online pretty inexpensively in most cases.
This is a simple repair n both cases but getting the laptop open is what takes the most time.

Another solution is to get some bluetooth speakers or bluetooth headphones and add a USB bluetooth adapter if it doesn't have bluetooth.
Another way is to open up the laptop, take out your wireless card and replace it with a combo wifi/bluetooth card. You can get these often for under $15 and you'll need to buy the antenna too (Black is wifi white is BT) for few bucks. Make sure you get the same type of card (mini PCIe, M.2, etc) and the side benefit is that you might get a faster wifi at the same time.