I dont wanna go back to school

maybe try not to focus on school as a social setting but as a learning experience then instead? focus on class and studying so you can be successfull in life. if you make new friends then great. if not oh well. youre looks probably arent half as bad as you think. try not to be so self-conscious. you are more than just how you look though maybe if you hate your reflection so much a makeover is in order?

Your ex and those classmates won't have to pay your bills in the future. They're just background noise. Remember: you have bigger goals. Why let temporary people steal them away from you???? They don't deserve your attention. Go to school. Learn a skill. In a few years, get a job. Everyone has to fend for themselves in the end. School then only remains as a distant inconspicuous memory.

So you’re not really 22-25?

It sounds to me like you're suffering from depression, as well as the other issues that you mention, and depression makes everything seem like utter shit when in reality it's rarely as bad as it seems. Whereas body dysmorphia makes you see yourself as something ugly or warped from reality, depression does the same to the world around you. You may actually need some support in order to feel better and cope better. That might be medication, it might be therapy, it might be both.

Stop it. School is there for you to grow you mind, not your social status. Divert your social angst into study fuel and get the grades. Grades right now are what matter the most.