I don't understand how I don't fit in with other moms or my friends. I'm 23 with a 2 month old. My…

I don't understand how I don't fit in with other moms or my friends. I'm 23 with a 2 month old. My friends either just want to hang out for 10 minutes and move on with their lives or just not answer the phone. And then when I'm at school picking up my nephews the other moms just want to see my baby but not me. It makes me feel lonely even though I have my son.