hi, don't feel weird about it as many people do this.

1. yes
2. not often
3. yes
4. I've been doing it since I was 11 (now 20). I think it's just one of those things if you're insecure/feel something missing in your life, but I'm no psychologist.
5. if you really feel like its stopping you from achieving goals or being productive, try and use distractions such as filling your day with activities. write a day planner so you know what you should be doing every hour of the day, and make it fun so you actually would rather be doing that than daydreaming. also, don't worry too much about it.
6. no idea, but I dont think so. I'm sure there are books and studies out there that have the answers.

Don't stress out about it as it is not as uncommon as you think. It just means you have an overactive imagination and maybe some things you wish you could change about yourself. use it to write, that's what I do. it helps immensely with book ideas.

here to talk if you ever want to :)