Umm, back when I was emotionally immature (14 to 23ish?) I'd get jealous and envious.
Then life happened throughout that time period. I hooked up with and/or dated every possible type of guy (average, model hot, guy next door, white, black, asian, latino, short, tall, buff, muscular, skinny, wealthy, poorer, etc.). Once you've had the once before "unattainable," and you peek behind the curtain, you really do realize we're all the same, and you don't valuate things/people the same as you did before.
I don't know if I'm a fully self-actualized person, but I can confidently say no man or woman intimidates me or strikes jealousy or similar feelings in me. I'm not trying to say I'm "the shit," but I am confident and comfortable in my skin. I suppose I've achieved a certain level of maturity in that sense. It really is a feeling of calm and peace.
Having said that, I do appreciate a nice body, just like I appreciate nice art. My inspiration to get off my rear and to work out (primarily running and ballet) comes from within and wanting to be a healthy and happy person (I enjoy ballet and running), certainly not from seeing another person or their results/talent. It's a cooperative process mentally, for me, not a competitive process.