Quick question before I go to bed

Is it normal to get sharp pains or more of like a discomfort for just behind your bottom hole sorry don’t know what to call

It (I am 16 and I worry a lot) I have no othe symptoms like blood in my poo my poo is normal no pain anywhere else well

It’s not really a pain is it normal or not is it diet related or something more sinister please reply quick need to get to bed.