how to get bc

so i turn 18 in less than 3 weeks and i’ve been trying to get on the birth control pill for the longest time, but i don’t know how to get it without my mom knowing. my mom doesn’t like birth control and won’t let me get it, but when i turn 18 i know she can’t control that. i have insurance to where i could get it for free, but i don’t know any of my insurance info because my mom has it. i’m only a senior in high school, so i can’t really afford to pay too much for the pill. is there anywhere or any way i could get the pill for free or at a cheap price without my mom knowing?