My DD is now 3 years old, I have been going to various baby and toddler groups and classes since she was a few weeks old. I haven't made a single friend. DD loves the classes and always has fun, but I come away feeling absolutely miserable and lonely. I've never been very good at making friends, but I do try to strike up a conversation with the other ladies, but it never gets me anywhere and no one ever invites us to play at their house or for a coffee. I feel so awful for DD, she doesn't have any little friends to play with because I am incapable of making friends. 
I am expecting DC2 this summer and I am terrified of having to go through it all again, going to these groups, to be sat on my own not talking to anyone, and to be so isolated and lonely in the early baby days.
Is there something wrong with me!? Am I trying too hard do you think? Has anyone else ever struggled to make friends with other mums?