feeling so guilty and less some help if you can

I sent some nude pic to someone without the face and I don't how I did that. this is the first time just I'm thinking what I have done like damn what's this feeling I couldn't look in the mirror I'm just I can't believe that I'm talking to myself since that time I'm asking myself why did you do that you are fucking stupid. Could be because I told him to send some pic and he said that he wants a face pic to send me his pictures and I felt he exploited me. Note:he told that he likes it a lot