Birth Control

Hey guys! I want to get birth control to help manage my heavy periods and acne but I don't know how to get it. I don't want to tell my mom because I know she'll think I want it for actual birth control. I'm not sexually active yet, but if she thinks I am, she won't let me go out or go to parties again. I'm not doing anything irresponsible, but a lot of my friends are older so she doesn't trust them. Help!