birth control

I am 18 years old and I am having sex. I want to get on birth control but my parents will not let me. Is there a way to get on birth control without insurance ? My parents have controlled my whole life so I am experiencing things for the first time and I just don't want my exploration to cost me the rest of my life. I am trying to be responsible by getting on the pill, I just really need help trying to figure out how to do so.