You mean Planned Parenthood?
You can go to your regular doctor. You don't need parental consent for birth control and your doctor cannot tell your parents. If you are having sex, you should also consider a pelvic exam and std check-- some doctors will want to do this before giving birth control anyways.
Wherever you decide to go, make sure you decide how the clinic will be able to contact you and how you are going to pay for everything. If you're going under your parents insurance ask if the bills will alert your parents about your birth control and what steps can be taken to prevent that-- if you can, I'd pay with cash.