Questions About The Pill

Hello! I'm 15 (16 on May 2nd) and I am starting birth control (the pill) soon. I was wondering what y'all have experienced, like does the pill make your breasts grow larger? Has it influenced your mood at all? If so, for better or worse? Does it make you gain or lose weight? I am starting it for mental health reasons, but I also may have PCOS, like my mom. So I think that's another reason? I'm not sure. I am definitely not sexually active (I don't even like guys), so it's purely for other reasons. Thank you for reading and for any advice!