You're making a false assumption that other people cannot enjoy what you're talking about unless they've experienced it themselves. If one has good storytelling skills and a solid theory of mind (concern for the listener), almost anything can be interesting. Even dreams.

I also disagree with your conclusion that an activity only has a point if discussed with others. A good deal of the best experiences in my life are things that were for my benefit alone, that I never thought to share with anyone else. And I'm a pretty social guy.