I like traveling solo. I wouldn't say I am great at socializing while doing it, exactly. Still, staying in hostels can boil down to meeting people by default. Unless it's totally slow season or out of the way. Maybe it's more a question of what you do with people after
you meet them? Having some idea what you'd like them to do, or not, might help I suppose.
You can choose to stay or go in any given place more or less as the mood strikes you. If you wish: You can do crazy things with the complete thrill of going at only
your own risk. Say, getting smuggled up the Li River in a locked boat cabin, and biking home in the dark around potholes galore in the rain... Whatever suits your fancy. A full entourage may not be so willing. You only want one free seat on the bus, which is not only less than two -- that is far less than the two consecutive seats you would prefer
(but which are often harder to find). If it's a plus, some people will approach you for a chat who otherwise might assume you're "busy." And you order just what you like for supper -- or whichever random thing you
prefer to point to, if you're out of your language range.
Downsides: What to do with your luggage when you are in the restroom?! Aside from the flippant answer, "travel light," you can trust the nearest shop keeper etc. if it's not too big, or you can just take it inside. I pull out a novel and use my bags as a seat/footrest in train stations, but you might miss having company there if you're used to taking shifts guarding the baggage. There's only one of you to look out for times and places you should get off the bus, wake up early, turn the corner, avoid stuff, etc. Personally, I am notorious for squatting down with a map for two minutes on every second street corner.
Again, only one if you manage to wander into unexpectedly hostile regions. Or say, if there is still any of that game of "let's try and intimidate night rail travelers into paying up some bribes" going on in Eastern Europe these days. I don't know if there is. It's also harder to sample a wide restaurant menu with only one person paying.