Hi...what stood out in your posting to me is that your daughter is only one.

When she gets to school, you will make friends. There will be opportunities to volunteer to go on trips and dads will be there to pick up and drop off. She will go to parties where the other dads are there, you will want to stay until she's comfortable anyway and so will men who bring their children to your house. Some parties will include adults...Put yourself out there as soon as she gets to school as someone who will help when needed. In this age of divorce....lots of dads have their kids on weekends and that's a perfect opportunity if you want it.
I suffer from depression to, and I have isolated myself but you have to work to maintain a friendship. And those friends may brighten your life a little.
You are entitled to a little guy time...