You're actually in a very similar situation as a good friend of mine. He started out doing bank studies before switching to his game design studies. His parents give him a hell of a time for it because just like your family they don't believe it's an actual career and a waste of time and money. He doesn't live with them, but they force him to go see them every weekend, he's only living on his own during the week. If he skips they give him hell for it.

The concern of it not working out is somewhat valid. It can be very difficult to find a good job in an art field. That doesn't mean you can't do it though, especially if you work hard at it.

As for them not liking your friend and your hobbies... Screw 'em. Do what you want if it makes you happy. I'm a gamer too and I still have a life. Sure, it's not ideal because I have no IRL social life, but I wouldn't even have my online social life if I didn't have video games, anxiety would keep me from an IRL social life regardless.

As for the main concern of navigating the next 4 years, I'm not sure there's much you can do, especially since you live with them. All I think you can do for now is try to make the best of it and ignore their negativity as best as possible.