Why is it weird to do things alone? I do it all the time, because I don't have any friends! LoL
Go out to eat, go to a movie, go to the library, go to a concert, go to a bar, go to the park, go shopping, roll down all the windows and go for a drive, etc. Almost anything you do with someone, you can also do without them.
Except seesaws. You can't do that alone.