Birth control

So I wanna go on some type of birth control (I’m 15 and don’t want to accidentally become a teen mom) but i have no clue which is best. I don’t know what the side effects of certain birth controls are and I’m in sports so I’m worried it might mess up my performance in those. Im also scared to ask my mom about anything because she doesn’t know about me being sexually active. I’m honestly so lost and there’s so much to consider. Do any of you have any advice?