Where do I fit in?

Sometimes I feel so lonely, and like I don't really have any friends, because I don't really "fit in" with anyone. Jade is almost 6 1/2. Most of the other moms at school are around 10 years older than me, and live in the "nice" part of town, so we have a hard time relating to each other. Most of the other people in town that are around my age, are just starting their families, so they only have one baby/toddler, and again, can't really relate to me, since I have an older child and 3 toddlers! It's just so hard sometimes, feeling like I don't really have any friends. I feel so isolated sitting at home all the time, but it is hard and boring to go out by myself. With winter just around the corner, I know it is going to get worse, the weather is already starting to get colder, making it harder to bundle everyone up and leave the house. I really wish I had a good friend that lived across the street or something, someone I could get together with often for play dates, another adult to talk to during the day.