Inside my head the world is completely different, and I am only 19.
What is it that is most different about the world inside your head?
I see myself as some invincible alpha male, just like in the Avengers.
You should try to get some help with that. You need to live in reality and not think you're an Avenger.
I know some people will say that it's a disease and should be treated with medication but I have a lot of fun with this inside my head so they should try it too.
It is cool that you have an active imagination, however just do not let these thoughts cause you to act like a punk. Just because you may be very confident in your head, does not mean that you need to act arrogant towards other people.