I am not that sexually active I have had sex once in my life. I have noticed this grey like skin inside my peephole. I feel like I've seen this a long time ago before my sexual encounter but I am not sure. I have no pain no discomfort, no random discharge, no nothing. Just seriously concerned if this is normal.
The normal 'rule of thumb' would be that if there is no problem being caused, and, this has probably been this way for some considerable time, then, there is no issue.
The likely thing you have going on is the appearance that is common on the external of your Glans / Head of penis extends down-over inside your meatus.
If you are really concerned the only people that can tell you is a professional medic. See a Doctor, or go to a Sexual Health Service and get it checked out.