My mom refuses to get me birth control

Well im 16 years old, i have a boyfriend and things have been getting pretty serious, we dont have sex or anything, but we do make out ALOT , hes fingered me and I told my mom that i want to get birth control because I want to proteft myself incase somethimg does happen. Well she got mad and refused to get me some, this scares me because i dont want to be 16 and pregnate. Im trying to be mature about this situation and protect myself, i know condoms dont work 100% , I damn sure know the "pull out method" doesnt work 100% well either. I live in Texas and I dont know how to go about getting some birth control. Please help. Adivce or something..