birth control

hi, i'm 15. i want to be on birth control (even though i'm not sexually active, but may be within a few months). my main reasons are 1. regulate hormones so acne goes down, 2. REGULAR PERIODS and 3. incase i become sexually active, id like to be prepared and used to a contraceptive. my mom is strongly against birth control (she was on it when she was 15 though...) and doesn't know about and REALLY wouldn't like my intimacy with by boyfriend so im not sure how to convince her. any advice?