Solo outings

So I'm about to attend a Green Day concert on my own. First time in my life doing that, I think in a sense I'm proud of myself for attending something like this solo, it shows that I'm prepared to do things I enjoy on my own purely because I enjoy them, but in a way it makes me a little sad to think that I don't have a friend or a group of friends that I couldnl share this with. What do you think about attending things like live music, movie, entertainment solo?