I do ride alone sometimes, but much prefer riding with my local club for a bunch of reasons:

1) I'm a group exercise kind of person- I feel like I go faster and longer in a group

2) I've gotten lots of technique instruction, which is great since I'm a beginner

3) I can try rides harder than I think I can do because the group I ride with is no drop, so even if they have to wait for me pedaling 5 mph up the hills, at least they wait and I know I'll finish

4) It's inspiring- I've met some cool women who started out rank beginners like me a couple of years ago and are now doing double centuries

5) It's a fun way to be part of a community group. I'm constantly amazed by the mix of folks who ride with us

6) I have zero bike repair skills, so riding alone is scary. That one I gotta do something about!