I'm 18 and still haven't started my period. Should I be worried? What should I do?

Have you talked to your pediatrician or OB/Gyn

Have you talked to your pediatrician or OB/Gyn

No I wouldn't know what to say. Quite scared of going

You say:

I'm 18 should I be concerned I haven't started my period yet?

18 is late to not have started so this could be a more serious issue and you should be scared that you don't know what's happening, not scared to talk about it.