Strict moms and birth control ???

I have had irregular periods since I first hit puberty and I think I need to go to a doctor or get on bc to regulate my cycle. The only problem is I’m fifteen with a strict mom. I don’t have a job to pay for anything or any form of transportation outside of her and my dad. We live out in the country/30min drive to any town. I need to talk to my mom about it but I’m not sure when or how, and I’m just scared of talking to her in general. Plus I’m worried about hormones because I have a lot of mental issues as well. I don’t know what to do...

Update: Mom said I’m not going to the doctor because “they’ll pump me full of hormones” and I’m being forced into a no sugar diet... woo...