I've been feeling the urge to break up with my girlfriend but I can't figure out how to do it.
Why can't just tell her you don't want to be with her?
Because she is so pretty and I'm worried that I'll never get with someone as good looking as her.
It doesn't matter how pretty she is if you don't want to be with her. Stringing someone along without really having feelings for them is unkind.
I'm just gonna end it.
If that's what you think is best. I really would try the talk with her and try to figure out if you can make it work. But I'm glad at least you're not in a string her along anymore.