Hmm jealous or envious.. If I see an exceptionally beautiful cis woman, happily married, several beautiful children perhaps. Fortunately my 'competition' in this area is slim. I'm tall, slim, good curves, not flabby or fat, and my face isn't terrible. I live in the heart of appalachia; Where most of the general populace is huge, overweight, and frankly looks inbred (far too many ). Hard to be jealous of that. Not being mean, just honest.
If I see something about me I can fix to make me more attractive I'll do it. Other than that, I try to put those emotions on the backburner. After all, some may be jealous of you too. Just live & let live. Be happy for that other person who looks beautiful, if you can.