I am thinking the same things. At some point you have to make friends from scratch. They aren't just given to you.
As for the "doing things alone" I've noticed that people don't like doing that. Traveling, going to see a movie, or attending an event all seem to be things that have a stigma attached to doing them solo.
Example #5 Going to a park, especially an "improved" park with kids playground and you're a dude.
Example #6 Wilderness hiking (although this is really a safety issue, and as a lifelong hiker I assure you your local hiking club is a fantastic way to meet people)
People (in general) don't like OTHER people doing that. They assume that the person going solo is lonely, sad, and is generally someone to be pitied, mocked, or both. The stigma is not attached by the people going solo, it's attached by everyone else.
Not doing something you want to do because "they'll all laugh at me" is you giving your consent to being made to feel inferior. Their opinion only matters because you make it matter, by caring about it enough to let it stop you from doing something you want to do.
You may feel like their opinion puts shackles around your ankles, but really the shackles only exist in your mind. Stop believing in them and they disappear.
Really? I'd say eating at a restaurant alone is unusual (carry a notepad and pretend you're a critic), but going to a rock concert or traveling alone is very normal. You meet tons of solo travelers in their 20s or 30s at hostels across Europe.
As for the "doing things alone" I've noticed that people don't like doing that. Traveling, going to see a movie, or attending an event all seem to be things that have a stigma attached to doing them solo.