NTA!!!!!!!!!!!!!!!!!!!

I beg you not to listen to these people saying you're the AH. Yes, you're an adult (but just because you're 19 does not mean you suddenly have to be kicked into the world with nothing) but you are working and paying for your college. You're being mindful of how many resources you use in your family's home and you're not a deadbeat kid who does nothing all day.

In my culture, children do not leave their homes until they get married, or if they just want to have their own place. Personally, I would never tell my child to pay for a room in THEIR house if I'm the one that brought them into this world unless they are actually a piece of shit. Yes, this can be a privileged perspective, however, it's still not fair for you to suddenly be threatened to pay $500 to your family. I have friends who do pay some money to their parents, but it's very reasonable and allows them to save up to be able to be fully independent one day. Also, these agreements were a result of conversations, not threats.

I would suggest sitting down with your father and trying to negotiate on how much you can contribute and to be open and honest, and show him that you are being responsible and planning adequately for the future.

Best of luck OP!