Why Am I Bleeding Pale Green With Red Spots During My Periods?

I ve been having some problem with my vagina and I don t know what s going on. I m 19. I m a virgin so it can t be an std. I ve been getting contractions, numbness, and pressure that happens on and off randomly. Sometimes when I m walking I start to feel an extremely bad popping and grinding pain on the right inside of my vagina. It hurts so bad that I can t walk while It s happening. And now I ve been on my period for over a month. It s going on a month a half. And just yesterday when I was taking out my tampon on the right side of it where I ve been getting my pain instead of just being just red period blood it was mainly a pale green with red spots. And just last week I found out I ve never had regular periods. The periods I normally get are usually 2 weeks or a few days longer. My periods are never heavy. They re light but just last a long time. The shortest period I ve ever had was a week.