Barnstorming on an Invisible Segway

Absolutely. I also find that when I do get those occasional pangs of, "Oh no! Everyone is having fun without me!", there's usually a much more specific dissatisfaction underlying that that I can actually productively address. Maybe it's that a whole bunch of people went hiking, and I'm just realizing that I'd like to go hiking with a bunch of friends; or maybe it's that X and Y were there, and I'm realizing that I'm missing hanging out with X and Y; or maybe it's that I wish I were more adept at striking up interesting conversations with strangers at science fiction conventions. But in any case, it's likely to be something that's at least partially within my power to do something about.