please read!

Alright so, I’ve had my period for 2 years, however it’s not consistent. I get my period every few months and I’m not sure why. I am overweight and don’t eat very good, could that be why? If i improve my diet and weight(I’m trying) would that help make it regular. I haven’t had a period in about 2 months. I 100% i’m not pregnant as well? Help? Also i’m petrified of having to go to the doctor and get a pap smear or whatever they do help. Would birth control help normalize it? Also, throughout the entire time I’ve had my period I’ve never had PMS, cramps, literally any sign that normally comes with periods. Except I get a migraine the week before I start and that’s sometimes. Is that normal?