I know exactly how you feel as I deal with this too. I think it's very normal, particularly when you're alone a lot or feel lonely. Human beings are social creatures by nature and any form of company is better than nothing at all. I've wondered in the past if I was crazy because, like you, I grew up with imaginary friends and pretended that my favorite musicians were with me or watching me, almost like I was in my own reality show that was much more interesting than I felt my real life to be. I was very social as a kid and pre-teen but after some traumatic family events and kind of isolating myself, those imaginary celebrity friends and audiences became instinctive, so much so that I grew uncomfortable in my own room because of the posters I had on my walls. I took the posters down and, despite being crushed due to a poster/picture obsession, I felt like my mind had been lifted out and emptied, I was so relieved. I had no idea the mental energy I was exerting. I still have the habit of pretending that I'm "the star" or whatever, but I'm also still pretty lonely and depressed because of it.

I say all of this about myself because I know how vivid imaginary company can become and I know how insecure it can make you feel about your sanity and stuff. But I've come to realize that human beings need company of any sort.

So, I think what you're doing is perfectly normal. Particularly in public settings where social pressure to look or be a certain way can creep up.

~RileyRonan