How to tell your mom you want to get on birth control?

Okay so me and my boyfriend have been discussing "it" and I told him it scares me. He said as long as there is protection it's fine but I know sometimes it breaks. So I want to talk to my mom about birth control without saying me and boyfriend have been talking about it. Please help I don't want to be one of those pregnant in high school people because the protection didn't work. Just please help me did ways to talk my mom into it.