Your parents are wrong. It's clear your family hasn't been treating you right.

China is a collectivistic society. Everything comes back to family. Honour is very important; dishonouring your family is a great sin. If a family has a member that is not "normal", they will hide them to escape the shame of not having a perfect family. What matters is what other people see. If someone does something wrong, it affects everyone else. And there is that constant feeling of being indebted to your parents: they raised you, and for that you should be eternally grateful. If they beat you, it's for your own good.

I might be wrong, but I speak from experience of my culture, and I think it's similar to China's in this regard, although we aren't as collectivistic.

You must feel guilty, ashamed, that there is something wrong with you: that's how their treatment would make you feel. But you are not to blame: they should care about you more than family honour. What is honour worth if it leads to suffering? In Japan, you have many young people committing suicide because they can't live up to their families' expectations and feel that they have dishonoured them.

I am sure many people are in a similar condition to yours, and feel the same way. You're not alone in that regard. I can't say your family will magically change. But you have to find out how to work with what you have. And I think the best option for you would be one of the big cities, away from family and with better services. Is that something that you could do? Many men leave to work in the cities, I'm sure. Perhaps your family would be able to save face by saying you had gotten better and gone to make good money. I don't know.