I'm 16 Years Old And When I First Got My

I'm 16 years old and when I first got my period I was about 13 it was excruciating pain the first time then it was totally bareable, in the past 2 years the pain has gotten so much worse to the point where I have to stay in the bathroom for 2-3 and can't wear a feminine product because I feel like I'm giving birth, also having sexual intercourse has gotten really really painful what do I do?