help! Asking parents about birth control

Emma
I really want to have sex with my boyfriend. I'm 18 and we've been together for a year and we're definitely ready. I 100% want to be on birth control first, but I don't know how to ask my parents. My dad would be fine with it but I think my mom would get really mad at the idea and start treating me differently. And no I can't go to a private clinic. Help me with how to ask my mom please. Update: I know I'm 18, but I'm on my parents insurance so they'd have to know if I went to the doctor