im scared

Im 18 and i have gotten my period in almost 2 months well after this month ends if I dont get it it will be 2 months i get the cramps and the pain but i dont get it my boobs hurt a lot too im not pregnant its just scaring me like could it be a medical problem usually after i dont get my period the one month i always get my period the next month on the first day but i have this month and im worrying a lot