Sometimes you need to take the lead when it comes to making friends. I found talking to other parents before and after school or activity was a great time to get to know other parents. If you find a parent you like or their is a child your child likes, invite them on a play date. It could be in a park after school or at your home. Invite both the parent and child so that you get to know them. I worked for us and now our son has a nice set of friends who will be attending his birthday party on Saturday. You can also just invite the entire class to a birthday party.