I'm a bit worried about my DS who is 2.8. He's a lovely little boy, sensitive and gentle, and usually warms up to adults he doesn't know quite fast. With children it's a different story - he'll sort of play near them but he has got no interest in playing with them at all. If we go to the park and there's another child on the climbing frame he either won't go on it or will hide. I have a few friends with kids the same age and they seem to want to be very touchy feely and hug and kiss him, offer him toys etc - he doesn't do any of that and if they try to hug him or whatever he runs over to me.
He goes to a lovely nursery 4 days a week and he's the same there. He's not so scared of those children as I expect he is used to them, but he doesn't have a particular friend and he doesn't really interact with them insofar as playing.
I have mentioned it to the HV but she wasn't concerned, says it's normal for his age. I just haven't seen any of his peers behave the same way.