Birth control

I’m 17 years old (12th grade in high school) I am sexually active but I am NOT on birth control but my boyfriend and I do use condoms. I’m thinking about getting on BC but I don’t know how to tell my mom. She has mentioned it to me by saying “if you need to get on BC let me know ..” but I would always brush the conversation off. So how do I tell her i want to get on BC. (I know I am able to go to DEHEC on my own to get on BC but I don’t want to do it that way). So PLEASE HELP ME what’s the best way to tell my mom that I want to get on BC.