I'm sorry to hear that you've had so much upset in your life recently.
To answer your question - I don't have children and am happy as a clam. I'm different from you in that I never really wanted children and when I never got pregnant I didn't bother getting it investigated, I just accepted it.
It's allowed me the freedom to do what I want at all times. I read the stories of motherhood on here and the problems of pregnancy/birth/baby/tantrums/school/bullying/illness/teenagers and I'm really glad I don't have to worry about any of that. I do what I want with my time and money.
If you've made a decision to move on, invest in yourself, your relationship, your career and your interests.
I'm sorry to say that you're facing what I remember as the loneliest part of my life, when nearly all my friends started having babies. They quite understandably didn't want to or have time to socialise and if they did, it was all about the baby. I learned to enjoy my own company. Sorry if that sounds bleak, it's not, I just got to used to going out on my own. And as you have a partner that's easier. Also, friends bounce back - babies aren't babies for ever. Plus I've made a lot of new friends through new interests.
I hope the messages on here are of some support to you. We're conditioned from birth to expect to be mothers but there is a large minority of women (I think it's about a quarter) who aren't and most of us are doing just fine.