Do I have a mental illness?? fantasy world...?

you're not ill. it might not be common (maybe it is and nobody else ever admits it) but it's certainly not abnormal. as long as it doesn't interfere with your real life, how can it hurt? and, let's be honest, if you gain self-confidence from it, how different is it from people who subscribe to personal affirmations (ie. in their head or out loud they tell themselves things like 'i'm a winner' or 'i'm going to go in there and ace this job interview' or 'everyone wants to be me because i am so interesting and self-ured' or even 'i love my body just the way it is...my curves make me y') ...just go with it...but i wouldn't go spreading it around because people will rip you apart for anything that's a little different about you.