What do you think about me staying out late after telling my girlfriend I could be home early?
Why would you tell her you'd be home early then?
She wanted me to stay home early, but I hate her for being so restrictive.
First off, there's nothing wrong with you wanting to go out and have fun.  Recognize that, and instead of lying to your girlfriend just tell her what you're doing.  She doesn't have the right to determine when you should be coming home.
Trust me she doesn't matter to me, I'm just going to lie to her. I'll make up some poor excuse about being at work, or an important work interview. She doesn't need to know.
It seems your upset with your girlfriend about feeling restricted. However, lying to her would only complicate your relationship and cause her to disrust you.