I lied about myself to everyone for so long I actually became the lie.
Why do you keep lying to everyone?
I've told people that I'm a cool guy, when in reality I'm just a wimp who can't do shit by myself.
Lying to others about yourself is not suitable. It will only complicate things in the future when you are not able to do something someone has been lead to believe you can do.
What about I'm going to lie for the rest of my life like a rat
That's just going to hurt you in the long run. You should be honest with yourself about your shortcomings and work to change them.