Hi, I have two kittens, one 10 weeks and one 8 months....they are beating the *carp* out of each other as I type...lol What you are experiencing is pretty normal kitten behaviour. I thought it would be all bundles of fluff and happy purring....how wrong was I? Just give him time my eldest kitten took a week to come out from behind the tv and my younger one although more sociable is not nearly as afectionate as the older one was [when it eventually came out of hiding] and is now. Talk gently to him, never touch him without verbally 'warning' him of your presence eg don't walk up behind him and touch. Handfeeding is a good way of gaining a nervous animals trust... believe me, half a cod fillet and you'll have a friend for life!
Good luck and let us know how you get on.
Lisa x