My mom is overprotective?

I also have an Asian mother, and she's quite like yours. Probably not as extreme though... But yes, your mother is overprotective and she's being very unreasonable. Seriously, nail polish isn't going to turn you into a stripper or anything. You need to talk to her, find out what her problem is, and try to convince her otherwise. If it doesn't work, then you'll just have to wait until you can move out at 18.