Birth control

Soo I am 16 years old and I’m having sex with my boyfriend. We use condoms every time no matter what. But I am always nervous that I’m going to get pregnant since I’m not on any types of birth control. My mother is completely against birth control and sex and everything. She doesn’t even like tampons. How do I get birth control without her finding out? To where I don’t have to use insurance so she can’t find out. She is super strict and I’m not sure what to do.