Can a person be too nice? Yes, and you should stop being that person… unless you want to be a saint, but in that case you can’t have a girl.
You know what you’re also being? Fake. And if you’re trying that hard that’s because she doesn’t notice you. Probably you’re attracted to that girl for the wrong reasons. Probably she’s one of those barbie girls that enters the room and makes all boys drool, and you’re just one of those boys. Look at her, enjoy the sight, carry on.
“Leagues” do exist, so play on yours. Don’t search for the perfect girl, look for a girl that fits you, that complements you.