My 2yo son does not seem to be too social. He cries when he meets new people and doesn't want to play with other kids his age. What is happening? Is this normal?

it is absolutely normal. babies will go through a lot of phases, where they will suddenly turn very social, then very clingy and unsocial and then the entire thing goes on a repeat mode again. do not worry much and let your baby be. do not force him to go out and meet people or play. be around with him and take him to outdoor places where he can see other kids, such as the garden, play area and the like. let him do what he feels comfortable doing. you can simply carry books and sit and read those to him, or play with him. as he grows, he will again start taking interest in others and make friends.