endometriosis or irregular?

So ever sense I started my period I've always had irregular periods. When I first started, There was a point when i just wouldn't stop bleeding. So the doctor gave me birth control to regulate it and it did.. for a while... I'm 20 years old now, and my periods are so irregular! I always thought bad sleeping habits, stress, or diet can throw it off.. but I just seen on my calendar my periods are anywhere from 28-58 days apart! I never have super bad pain when I'm on my period or anything at all.. so I don't think it's endometriosis right? I do have a family history of that! I'm scared!