i am having problems with masterbuting

i am 17, i started to do masterbution 2 months ago when my boy friend requested me to have phone sex with him, becouse of long distance that we have and we have to satisfy our needs by doing so.....
after i stated doing mastrbution after my scound time which was two nights later then first night..i felt terouble pain in my stomach, and my periods which in the previos it was every 30 days, it changed to 12 days or sometimes one week, and after a while it was perfecty normal, but after i started masterbuting again my periods are getting shortar then normal(period the blood which comes every month from a ladies ....) and the stomach problem..... i am very worried about this i dont know if it is normal or not, is their any problem with me or with masterbution? shall i stop masterbuting? what is the reason of periods why are they back again in 10-14 days, its not normal, and my stomach pain....(i am a virgin and i never had sex in my life)
is this problem going to effect me in future when i want a baby?
and any other things u better know please advise me and help me, i would be so thankfull!