What's wrong w/ me

Ok so ever since I got with my SO, my periods have been irregular. Before it would come the beginning of every month. But now I would show spotting for a couple of months and heavy bleeding the next. Then I'll miss a month or two. When I thought I was pregnant I took a pregnancy test but it was negative! So many months past by and I told my mom that my period didn't come and she told me to go to the hospital to check if anythings wrong. So she took me and they checked me but the doctors said that I had tiny cysts on both of my ovaries but she said its nothing to worry about. Now it's been a year and my periods are still irregular. My SO tells me to go to the doctors and get checked but I am VERY affraid. I'm 20 and I feel like I shouldn't have this problem because I'm young. I know that my weight plays a big part in this because I'm overweight. I tried losing weight but I need motivation. I'm constantly crying and depressed about my situation. I really can't talk to anybody about what's going on because they don't understand. I just don't know what else to do 😓