periods

hi guys i have a question, so i’m 17 and i’ve been having my period since i was about 13 and it’s been regular up until last year and it would skip a few months periodically. i’m a virgin and have never done anything so being pregnant is out of the question. i’ve heard stress and malnutrition can cause periods to be irregular but i always assumed it was just due to stress because i’m 5’7 and now weigh 130 so it couldn’t be from food, or i thought idk. i saw somewhere someone said you have an ed if your period skips for more than three months or whatever and obviously i’m not going to self diagnose but i’m too scared to tell my parents because they would say to “just eat” and like yeah i eat but not that much and idk i just don’t know what to think, do any of you have ideas :/ also my period has been late for 27 days now but they’re usually a few months apart