birth control help

Hey everyone. I'm here to ask this and I really don't want to be judged so please just leave if you're gonna judge me. 
So I'm 18. And I am not on birth control. I don't sleep around but I think that I should go on birth control just in case. Cause it happens! 
Anyways I don't want my mom to know that I am on birth control and I'm just wondering how much it costs without benefits since I won't be under my parents. Also, where can I go about getting onto birth control???? I really need help I am so clueless.