Whats the best alternate for birthcntrol pills for a 17 year old?

Lots. Depoprovera shots every 3 months, the vaginal ring, intrauterine devices are all effective options.
Abstinence. Abstinence is most confident way to protect yourself from unwanted pregnancy and sexually transmitted diseases as well as to keep your uniqueness for your match. I recognize that there are other opinions on this matter, but this the standpoint i hold to and lived out.