> Enjoy the moment. Relax. Observe your surroundings. It's sad seeing people who cannot deal with lack of external stimulus [...]

This is what I want to do (and will try to). It's not that I cannot deal with a lack of external stimulus though, it's just that I'm too anxious and in my own head. But now that I've reached 30 I've started caring a lot less about stuff like this and think I might be able to (for example) enjoy a meal in a restaurant on my own, or sit and have a glass of wine somewhere, if I wanted to.