missing periods?

ok, i know this is stupid to say but im just so anxious, my period has been late for almost 100 days now, the last period i had was in may. my cycle is pretty normal, it would go up to the 29-40 day mark, but not this far. i have discharge thats tainted red but its not actually a period. usually my periods are really heavy so it wouldnt be normal for me if it was suddenly light. i dont know if something bad happened or if my period is put on hold since im 14 and my body is still developing, but that shouldnt happen because i already had normal cycles ever since i was 11, right? anyways i need help and im too scared to look it up online and see that i might have a disease. :(