Moving out will be a godsend for you.
I had a friend who went through a very similar experience - Asian parents, they hated him 'wasting his life playing video games'. He did extremely well in school, got his bachelors in medicine and even patented and sold a treatment for cancer, but his parents only focused on the fact the he played video games and basically disowned him. He felt hurt and guilty for a long time because his parent's didn't approve of him, which is very messed up.
Your parents sound to be in the wrong here, but if you're under their thumb there's not a whole lot you can do. I think it would be a good idea to try and talk to them about the very real benefits of gaming/building your own PC as well as the importance of having hobbies and not getting burnt out on school, but expect talking to them to be very hard/impossible. Still, I think it's your only option until you're able to move out on your own. If you're able to drive or can get picked up by friends, being out of the house often is a good idea. Maybe try picking up another activity they "approve of" like a sports team/chess club or whatever you enjoy. You'll have tons of freedom and time to do whatever you want in college, it sucks but gaming can probably wait. Best of luck, I'm sure things will be better in the future but for now you have to live through hell.