I have bleeding after I do clitoral stimulation..?

I've looked throughout the internet and I couldn't find out what's going on. I am a virgin and I don't use any form of penetration and I am not on any medications/birth controls/etc.. but every time I use clitoral stimulation, I start to bleed. This has been going on for a while and it's getting worse. Almost a year ago I had a soccer ball sized cyst taken out of my fallopian tube(Also had the one tube removed) but I'm not sure if it has anything to do with what's going on. It started after that though. I've been having VERY irregular periods(Every week I have some sort of bleeding but it's only for about a day or two) but every single time I masturbate, I bleed. It doesn't happen right away, it takes like a minuet to start coming out but it is fairly heavy. I am getting kinda scared and I don't want to go to the doctor to ask because I am 15 and it just seems embarrassing to me. Please help.