I'd like to pretend to be someone I'm not
Why do you want to be someone else?
I'm tired of being myself. I want to be someone else for a change.
I don't think you should pretend to be someone else, you should always try and be yourself when you are around people. They will be able to tell if you're acting like someone you're not.
Nah, I'm just gonna pretend to be someone else still.
I think that you will get more respect from people if you are just yourself. It is decieving them to pretend to be something that you are not.