Im feeling resentful that my friends are having kids?

Im 35 and single. All of my closest friends are married and have children. i was so excited when they all had their first (within a few months of each other). It was such an exciting time for all of us. But now all 4 of them are expecting their 2nd child on cue. And somehow i am feeling really resentful and angry. part of me feels like, oh give me a break you guys are all so predictable its pathetic!! take a risk or something different. Of course another part of me feels like im totally left behind. they are having their 2nd, i cant even get a date. kinda sucks.