I keep getting more and more depressed. :(

I've got about 20+ girls who I went to school with that are pregnant/already have kids. I've only been graduated from high school for almost 2 years now. All of them didn't even attempt to try and get pregnant. All happened by accident and none of them are living on their own, or married. It just upsets me that I'm the only one living on my own, and married and actually trying for a bundle of joy!! I am just upset :(