pink, I'm entirely with you for all of your goals! I think I probably prefer running alone, but I still feel like I'm a member of a running community now, partly because of the Run Mummy Run FB group (and the spin off Run Bitch Run).
Give us a 3 sentence description of what each of those groups (RMR & RBR are like)? What do they do for you or talk about, what were the last 3 discussions.... They're closed so I can't see what I'd be joining...
Run Mummy Run - a really supportive running community for women. Lots of posts about training, injuries, races etc. No swearing though, and you can only put injury shots in the comments. There's also an RMR shop for running gear.
Run Bitch Run - this was set up by Totes Inappropes (FB blogger / runner) when she was kicked out of RMR for swearing. It's for men and women. I think posts are meant to be about running, swearing, and drinking gin 😄. Injury shots are welcome. And yes, you can buy t-shirts emblazoned with Run Bitch Run on them 🤔.
I've definitely learned a lot from these groups, and it helps to make me feel like it's not just me lacing up my trainers in the morning.