Birth control Question

I’ve been wondering about going on birth control for a while but I don’t know how to bring it up to my parents without seeming like I’m sexually active- because I’m not- I want birth control for period Bc I get super bad cramps- And I don’t have a good relationship with my PCP (I screamed at the doctor when i was having an anxiety attack about taking my clothes off for a physical and she kept pushing it). we’re holding off getting a new one until I’m 18 (6 months) because it doesn’t make sense to get a new one to just have to switch again- so I don’t know where I would go

And tips / advice would be appreciated