I don't want to grow up.
Why don't you want to grow up?
Because I'm so fed up with responsibilities and bills.
Part of being a human is maturing and growing up even if you don't quite want to. Have you tried talking to someone about your situation?
I tried.
What did they tell you then? Unfortunately growing up is a part of life, and we all have to do it no matter what or else our situation can get bad. How about doing what you are expected to, but put some time aside to let out your inner child again?