Birth control


So, I'm 16 and whenever I ask my mom to go on birth control she changes the subject, I do have a boyfriend that I do plan to be sexually active with in the future, but for rn its more about controlling my period, making it consistent, and lighter, which I've heard the pill does. 1. does the pill make your period consistent? and 2. does it lighten your period? and 3. how would any of you suggest I ask my mom and get her to take it seriously, I've told her multiple times it's not because I'm sexually active and don't want to get pregnant, I really do just want more control over my period. Any suggestions?? Feel free to be honest with your opinions, I won't get mad.