Gyno probs

Hi ladies! So I've been 21 since November and I've been sexually active since I was about 19. My mother is very against sex and refuses to let me go to the gyno (which I could do myself but I'm on her insurance.) and I think it's because she thinks I'll ask for birth control. I know how important it is to go... But I can't really make her want to let me. Advice? Suggestions?