Are you identifiable in the pictures? From your face, a birthmark or other distinguishing feature? Or does the background (your room?) identify you as being the subject of the pictures? If not, then chalk it up to experience and forget about it. The person you sent them to just has some random pictures of some random person, which nobody can prove is you.
(Top tip: before you send any picture, imagine that it is immediately available for the entire world to see; if you're not happy with that, don't send it.)