He's generally comfortable with himself, the only thing he's really concerned about is that he wishes he were taller (and he's probably not going to get very much taller, which might bug him more when he's older but for now he's still holding out for a major growth spurt).

Other than that, he thinks he's handsome and about as strong as he can be expected to be at his age. He pretends not to worry about his appearance too much but he makes sure his hair looks good before going out (and really hopes the other teens think he's good looking even if they aren't into him).