Feel inferior to this woman

[Dontsayaprayerformenow]

It's somebody my partner works with, she's mid 20s and I'm early 30s.
She just seems so 'together' and for some reason makes me feel insecure.
I'm slim, but she's very slim (stupid I know)
She got firsts in her Degree and Masters whereas I got a 2:2 (i know I'm really picking at straws)
She drives I don't, she has a bigger home than me.
She's in a management position and I'm not (probably on a little more than I but not tons more)
Just seems very self assured and never comes across badly, very assured at her job.
Just has a very 'professional' manner about her, but also very liked, and my partner seems to have a lot of respect for her.
I know it's irrational and my problem, she hasn't done anything unkind towards me, I just feel like I'd never match up and that my partner has 'settled' for me instead.
I know comparison is the thief of joy.

@Wob is sort of right but I agree with PP that the answer to our insecurities shouldn’t be to comfort ourselves with all the ways that another woman is probably secretly struggling or messing up. That’s really unpleasant. Often things aren’t what they seem on the surface, of course, but how about we also aspire to increase our own self confidence to the point we can admire another woman who seems to be doing well in life without having to tell ourselves that she’s probably covered in spots under her clothes or something.