She sacrifices things for you, and you also do it for her. Sometimes, we all have to make a sacrifice for our loved person. These do not necessarily have to be big and important things.
Even letting your beloved one have a last slice of pizza is a little everyday sacrifice. If she does these things for you without regret and enjoys it, and you also feel the same about her, this is love.
She is not trying to change things about you. We all have flaws that would drive the others up the wall. But your girlfriend knows everything about your imperfections and accepts all parts of you as they are. She is alright with all your quirks, even those that you thought no one would ever accept. And you are also pretty fine with weird sides of her.
Find seriously