Starting Birth Control Nervousness!

So, basically, me and my mom agreed that I should start birth control before I go to college in 2 months. She told me I could schedule the appointment and go in and talk to an OBGYN, but I was just wondering if the doctor would ask about anything about my personal life. I just don't want my mom to catch wind of anything. I'm almost 18, but I was wondering if the doctor could still inform my mother or if the doctor-patient confidentiality applies to minors. Sorry if this sounds dumb, I would just really appreciate some advice from someone who's been in a similar situation.😭