My life is being controlled?

Im 19 and I feel like my mum is controlling my life more than ever before. She gets really overprotective when I want to go out to clubs and bars so much so that I have to lie if I want to go. She wont let me get any piercings although i secretly have 2 piercings and a tattoo she doesnt know about. I dont know what to do because Im feeling so stifled...I thought things would be different once i turned 18 but it seems to have gotten worse. I just want her to accept me as I am and let me do what makes me happy.