I enjoy riding on my own, it's great to spend time outdoors in your own thoughts, own pace etc. My longest rides have been alone.
In Portugal, I am a member of a Club and a Race Team. Our Club rides are great, a group of friends who train together. I also ride with my Coach when there, mostly just the two of us. Then there are other, larger Groups I join and it's really nice.
Here in the UK I joined a Club locally last year and was utterly turned off by the whole 'rules and regulations' aspect; far too regimented for me! Briefings! Health & Safety! I mean, obviously use signals and watch out for each other but the riding side-by-side, not over-lapping wheels, specific signals. Army-like formation precision...spare me!
So I only went to one ride and never again.
I've since moved and joined another local Club...unlikely to ever meet them, only joined to pinch their routes while I learn the best local roads.
Can't wait to get back to living in Portugal permanently again in the next year or two - much more informal and fun.