Asking to go on the pill

I'm 15 turning 16 in 5 months and I want to go on the pill for like my skin and cramps my periods are pretty regular and I never complain about my cramps tho and my acne is only pimples on my chin and 1 or 2 on my temples so I worry she'll think I'm like having sex or something lol and idk how to bring it up or ask her to go on it because I'm not very close with my mum about this stuff at all help please 😂 help come up with more reasons haha and I also wanna go on it cause like I said I'm sixteen soon and incase anything happens 😉 I wanna be 10000x safe but def not mentioning that haha