Did I make a mistake??

I took a big step last week. I joined a "Mom's Group". I have looked for one since we have been here so that Luke and I can get out there and make some new friends. I wanted to find a nice, casual group that went to the park and the mall and just hung out, not the baby boot camp, super mom group. So I found one that looked right for us and decided to take the first step. The day that I joined, the girls were having a mom's night out at TGIFridays. I thought that sounded like a great way to get to know everyone without hiding behind Luke. I called the group leader and told her that I would be there at 7pm. I told her that I would call her cell phone once I got there so she could meet me, since I didn't know what she looked like and vice-versa. She thought that was a great idea and that she looked forward to meeting me. So I got dressed in something that didn't have spit up on it, put on make-up, even used lipstick, and headed 30 minutes across town to meet my new induced friends. I arrived promptly at 7pm and made the call. Oddly, though, a man answered the cell phone of the mom I was calling. He told me that it was indeed her cell phone but she didn't take it with her. My first thought was, "she's out without her children and didn't take her phone?" I can't imagine leaving and not having a way to be contacted in the event that something went wrong at home. (That being said I have the utmost confidence that Brian could handle it, but I would want to be reachable) My next thought was devastation. I walked into the restaurant and looked around, hoping that I would magically make eye contact with this group of strangers and they would know that I was one of them by my desperate look. The look that screams, "I need adult conversation and a nice glass of wine. I need companions. I am one of YOU". Ultimately, that didn't happen. There were several groups of women gathered and none of them seemed to be looking for me. I got back in the car and did what all women in that situation would do...I cried like a freaking baby! It was such a big step for me to go and meet strangers and try to make friends, not knowing if we would have anything in common other than our kids. I was let down, hurt, wondering if I had just made a big mistake joining this group and feeling like they didn't want me already. I felt like I was on a blind date and the guy took one look at me as I walked in and hid in the bathroom until he was sure I was gone.
I was supposed to go to a group picnic on Friday with Luke but we just couldn't make it. I don't know if I can do it. I really want to have companions, and I want Luke to have friends to play with, but I just don't know if I can put myself out there again. I hate rejection!