Besides all suggestions above, I think there is one more thing t

Tell him that everybody is special, your son is very much special. So it is normal that what you are interested is different from others. It is also fine to feel lonely sometimes, everybody does. However, as time goes by, your son will finally find someone who is very similar to him and together could be very close friends. The important is to be patient, not give up, and be nice and open to everyone. There is a book called "Hi Harry" (I hope I remember the name correctly, a very kid book but makes sense) The turtle tried very hard to play with rabbit, mouse, etc. but failed, because they are good at different things, it's nobody's fault. However, when he felt very sad and he finally met snail, they two can play together very well, because they are both slow. Happy ending. Guess you son might like this story and feel better. Of course, he can also try some popular games to make himself not too special. :) My son has the same problem sometimes. Good luck.