Please help me

I have been late on my period for quite awhile. Yes, I’ve tested already and it was negative (tested a week ago). My last period was from 8-12 of December. It’s now a month and a half and nothing. I have no physical symptoms of a pregnancy and I’m just trying to figure out what the hell could be causing my lateness. The only things I’ve been struggling with is acne, which it has bloomed over my face and ass, and sensitivity - to like being softly punched when it actually hurts. I don’t know what’s wrong with my body. This isn’t the first time I’ve went a whole month without a period, but never this long. If there’s any way I could start up my period again, I’m down for it because this is just annoying. And no, I don’t have any insurance to go to the doctor for this.