I Have Always Had My Period Every Month , But

I have always had my period every month , but this month I haven't had it , and it's worrying me , I am 19 years old , I am not sexually active and I've never been to a gynecologist , I'm not going till I get married , I'm just worried , I've been under a lil stress , and sometimes I have bulimia , I know that's not healthy , I just need some answers , I know for a fact I'm not pregnant , just please get back with me