I found myself masturbating to my 12 year old cousin

25M. <br>She was visiting for the summer and we were sharing a room. <br>She sleeps extremely naked and often has no underwear on. <br>I found myself looking at her a few nights. <br>I don't know what's wrong with me. <br>I've stopped looking and now I sleep with my television on so her shadow can't be casted on the wall I'm facing.