Oh, 5yrsandcounting I get it. I really do!
To continue your unflattering comparison... in my head, I'm Julianne Moore. But for some reason MIck Hucknall keeps staring back at me from the mirror... 
I also struggle with the whole 'love yourself' narrative - what does it mean? It feels like one of those trite things people say but I think I've finally (after 6+ years) got a handle on what it means. And I'm choosing to take the 'love is a verb rather than a feeling' approach.
So I treat myself with respect - how I'd like other people to treat me and how I'd treat others.
I have lost a stone and have another 1 maybe 1 and a half to go; I've joined the gym and I swim/walk a couple of times a week. It's never going to make me super fit/slim/beautiful but it's something and it's making me stronger; I am doing Dry January with a view to drinking occasionally rather than routinely afterwards. I eat reasonably well but don't deny myself either. That's how I'm respecting myself physically.
I had a few people in my life who were emotionally draining or just not good for my soul. So I've removed them and, where I couldn't, I view them differently - I let them bother me less. Their view of me doesn't change who I am.
I make time for hobbies (less of the beer and more of the bass guitar
); I practise more self care more 'mindfully'; I spend more time in, and appreciating, nature.
I suppose I just value myself and who/what I am more rather than berating and being angry with myself for what I'm not. I'm more 'mindful' generally and have started keeping a bullet journal to focus my mind.
My relationship background sounds very similar to yours. I look at my ex and I wonder how he does it and how I can be so unlucky/incapable of similar.
But actually, I do think it's because he loves himself!
Take care of yourself and good luck 