You don't say where you live - and laws about abortion vary state to state. Many states require that minors have parental permission for an abortion.
However, let's not put the cart before the horse here. Do you know if you're pregnant for sure? The first thing you need to do is take a pregnancy test.
The BEST way to do that is to go to a pregnancy center. The tests are free there and they also offer all the information and help you need if indeed you are pregnant.
There you can find a center near you. Call the 1-800 number if you need to - there are always really helpful women that answer all your questions - confidentially.
Please post again, and let us know how you are doing.