I can totally identify with your feelings. When I left my exH, I really struggled with feelings of discontent. At 30 years old, I was moving backwards in life. I wanted the dream, 2.5 kids, house with the white picket fence stuff. Moreover, I wanted to be GOOD at being a wife and mom.
Not only was this dream not realized for me, but I wasn't even good at it when it was there. (this was how I felt at the time- now I realize that yes, I made mistakes in my marriage, and I owned them. Overall, I feel good about my role as a wife- sometimes it haunts me though, if I'm honest)
Then, I felt weird because most of my friends were at completely different stages of their lives than I was. I didn't have a place that I "fit."
I just tried really hard to keep moving. Got involved with a local church and made some friends there. Leaned on those that cared about me a LOT. Cried when I needed to. Sometimes I took things minute by minute.
Slowly things began to change for me. DS and I settled into a new normal. Started grad school (which feels like my niche!) Began dating my really super cool and totally awesome SO.
You are such an amazing person! I'm sure you can do anything you set your mind to. If I can do anything, let me know.
Lots of hugs to you!