I have a kenmore elite compact refrigerator model 5649149910 and everything inside is freezing on the lowest setting

Disconnect the defrost element and check with a multimeter for continuity. If there is no continuity, the element has failed. If the element is good, check the connections.

There is usually a Defrost Timer, but this uses a Defrost Sensor. Put 'defrost' into the Parts Search.

Heater
https://www.searspartsdirect.com/product/2i5x3d492k-0046-795/id-mee62105201

Sensor
https://www.searspartsdirect.com/product/1ff3ug3vf2-0046-795/id-acm73919201

https://www.searspartsdirect.com/model/2eozk34nvj-000583/kenmore-elite-79572053110-bottom-mount-refrigerator-parts

Timer normally
https://www.google.com/search?q=Kenmore+Elite+refrigerator+795.72053.110+defrost+timer

For Control Board replacement, I always advise getting a service call due to cost and warranty.

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Its either a bad defrost timer not kicking on, bad main control board or the temp switch. Sorry not much help but the only way to really tell is check with a ohlm meteor and eliminate each part.

there is a flap in the refrigerator side usually near or behind the light bulb the freezer side is thermostatically controlled with the compressor being controlled. On the refrigerator side the cold air comes from the freezer side. when this flap is open the refrigerator will cool continuously, Check the flap or the duct assembly
here is an illustration of the part
http://www.repairclinic.com/Kenmore-Refrigerator-Model-10674219400-ID-927868-Duct-Venting-Parts

Seems like you set it at the lowest as you mentioned, try the recommended setting. The lowest is the coldest, that will freeze up your food items.

Friend, the control is malfunctioning thats why it wont work when selected.try to clean the parts inside

check position of thermistat bulb it should be on the plate

Replace cold control

repl thermostat and set freezer air control to the middle

if you haveno control of the temp. it is the cold control t-stat that is bad, but first i would sett all controls to factory setting and allow to run for 24 hrs to confirm

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Is everything really frozen or just the top shelf stuff? You may have a thermistor (temp sensor) problem if the compressor just runs and runs and runs all the time. Take a glass of water and place a thermometer in it for about 3 hours then take a temp. reading. That will let you know what the real temps are. See if you can cause the compressor to kick off and on by changing the temp settings (go to real low for about 5 minutes then back up to high). Let us know what happens.