What 25 and Lovely P wrote you is something you really need to focus on.
Thinking of others is not a MNG trait. it's a kind human being trait. If I found $100 I'd take my friends or daughter out to dinner and buy my daughter something special.
I baked an apple pie the other night. Apple pie is my ex's favorite. I brought him and OWW a piece at my D's football game. It was not at the detriment of myself, it was attached to no expectations, it was just a kind gesture.
Yes, MNG says you should focus on yourself more. Not to stop nice kind behaviors. It's when we do things for others and it is to the detriment of ourselves. Doing nice things for others shouldn't hurt us. It's when we attach expectations to them that they do. or when we neglect our own to fill another's.
When we say don't worry about your W, we mean you worry too much about what she does and why she does it. That has nothing to do with MNG.
Like LovelyP said, it you shouldn't find kind acts which are normal as a sacrifice.
You use others to guide your actions too much. If you didn't use others, I would hope your intentions and actions would still be kind acts. because that's what you want to do. Not because they make you some sort of martyr. They shouldn't feel like a sacrifice.