Wounded- I really would suggest some sort of therapy. Not all therapy cost money. You can go to a church pastor for guidance or you can possibly go to seek therapy through free services in your area. To me you seem to have lost your self worth. It doesn't sound like a healthy relationship at all. You are not living for yourself, you are living for him and only you can stop the cycle you have been in for what sounds like a long time.

It will be the hardest thing you have ever done but, once you learn how to care about yourself and once you realize there is a better brighter life out there for yourself you will start to get stronger.

I suggest that you start to sock away every little bit of money you can. I don't care if it is only change. Change makes dollars. I know if sounds small but, when you have the strength to leave you at least want the means to leave. I only say, leave because I have a hard time thinking that anyone in this situation would find any reason to stay.

Get help
Save money
Every change you get look in the mirror and say something positive about yourself (you deserve more than what you are getting)
Do one small thing for yourself each day, no matter how small
Start reaching out to your friends again. If they were true friends they will not questions you, they will just be there for you. Even if to listen.
Help your parents- They are the only reason you are on this earth.
Love yourself
If he gets abusive again (pushing or verbally) leave.
You can't helm him or your parents if you can't help yourself.