Dear hollypop:
To add to Nina’s wise, very well articulated advice:
When you realize you just compared and felt the resulting resentment, don’t chastise yourself for thinking and feeling so. Don’t say to yourself something like: “I shouldn’t feel this way; I should feel that way instead.”
There is a valid message to the comparing and resenting, the message I believe is that part of you is hurting for believing you are not good enough. Not as a musician, but as a person. The “not good enough/ not worthy enough” is dwelling at the moment in this particular comparison, because you are currently involved with music. But if you weren’t, this “not good enough” core belief would have dwelt in another context.
This is why the core belief needs to be attended to, more.
anita