Pls help

I'm 16 and I'm in need of advice. I'm a little new to this I've only been sexually active for little over a year but neither of my parents know. I recently got a new boyfriend and we started doing stuff, sexual stuff and he cut me real bad inside and it really hurts & it was doing fine until he insisted on doing stuff again and I thought it was ok because the wound wasn't hurting anymore but ever since it's been hurting like crazy and it has a greenish color. I need advice bc I can't talk to my parents about this. What can I do to take care of it?