yea - and as many others I see have already posted - it's natural to 'compare'.
The key is to understand the difference between 'compare' and 'compete' maybe ?
Comparing let's us do a little self analysis at times and even point out areas me may discover we've been slacking in. Not a bad thing. And like someone said - it also allows us to see good qualities in others and just have an appreciation of them.
But letting that get carried away and becoming a 'competition' is where it can turn to negative.
And that was funny about your GF. You can probably have some fun with that.