teenage son eating for comfort

I think my 16 year old son is having problems with a bit of depression and he is unhappy with his weight (he is overweight but he has never been skinny) but whenever he is down and/or bored he just eats and eats, and he is often bored. By agreement with him we have no sweet or fatty snacks in the house and have brown bread much of the time as he will eat a loaf of white bread in an afternoon. I have discussed that he needs a healthy diet that matches his activity and its OK to eat nice things, just in moderation. We encourage him to exercise and I recently started a weight loss competition with him as I would also like to lose weight - if he wins he gets some money, if I win he does the housework for a month. After a good start he is now putting on weight again. Part of the problem is that his group of friends never get around to doing anything so he spends all day at the weekend and every holiday playing computer games and not leaving his room. He and his friends will only meet up if there is three or four at least and by the time they have all been in touch its almost the end of they day. My son is bored and really wants to go out and meet up, preferably to play sport of some sort but it hardly ever happens so he stays in, feels miserable and eats. He won't consider any kind of organised group or club activity, won't go swimming because although he's good at it its boring doing lengths and his friends won't go. He runs a bit but hates it, he would play tennnis but none of his friends will and his dad no longer can because of really bad tennis elbow. I can see the summer being ten weeks of not leaving his room and eating. He would like a job but when it comes to doing something about it himself its always tomorrow, next week never now, nothing is ever now and he is so easily discouraged. Last week he decided to revisit his guitar, found a difficult song he liked, discovered he couldn't play it and that its, no more guitar. He has never been inclined to practice things he found a bit difficult even if he really wanted to be able to do it and this also means he doesn't want to do anything new as others will be better than him and he would have to work at it to catch up. That's a long list but I am getting increasingly anxious about this summer, which isn't that far off really.