Seventeen y/o Birth Control Pill...?

I am seventeen years old and want to be super protected for my first time.... and birth control pills help with regulating periods and cramps and stuff. So I want to get birth control, but I know my mother will only think just because I have it I'll go off and have sex with my boyfriend (who I have been with for over a year). So, I was wondering if I could call the doctors office my self and make my own appointment just to get the pill from my doctor? Also, there is a place called Pro Health in Fitchburg, Massachusetts that I have heard of. My sister went there and told me that when she was seventeen (about 6 years ago) she got birth control there and it was free. I don't know if it is still, but if anyone had any information about that then that would be really helpful. Thank you so much!