I wouldn't categorize this as falling withing narcissism.

There are different types of envy I think. One is envy of other people having what we don't, whether that be material objects, relationships, personal status, or even ease of life. My own envy however stems from outrageous differences in treatment.

Envy has plagued my life for some time. I have a lot of anger for what I feel as being past wrongs of my mother as an example. But therapy has helped especially with improving my self worth. For, coupled with my envy was a questioning of my worth. It wasn't just that I felt my object of envy being undeserving but that I felt that perhaps I was deserving of what I viewed as attacks against me. CBT in particular has made me realize I had done nothing wrong and didn't deserve the slights.

Again, therapy has and is helping. My relationship with my brother has greatly improved. For, his receiving of more love from my mother was no fault of his own.