Birth control , tampons , more lol

Mary
So my moms like over protective. In turning 18 next month btw. 
She doesn't know im not a virgin
I ask sometimes to be put on BC because of cramps, even if it's just to help me feel safer  but she's just againt anything that have to do with sex 
She wount even buy me tampons because she claims it's just for women who have sex 
She gives me all this talk saying boys will only destroy your life , they only want one thing. Even if I know she's wrong because I'm with somebody who's proven me otherwise. 
Just comes to show parents don't know it all. 
She's a foreign mother too so Eh explains. 
Just wanted to share that. Any advice ?