Hello xany: Honestly, the Skeezyks doesn't know about this.

I'm an old married guy who despises himself.

So go figure...

Quite a few years ago now, I participated in a partial hospital program where they told us: "Don't
should on yourself." Don't place expectations on yourself & then beat yourself up for not achieving them.
From my perspective, the idea of only being able to find a good partner if you love yourself deeply is one of those platitudes that the world would probably be a lot better of without.

All it does is to set up unsubstantiated & mostly unattainable expectations that people then end up beating themselves up over because they can't possibly live up to them.
I don't know why it is you have not been able to establish a good relationship. It does seem as though this is something that has become more difficult since I was young. Back in the day, as they say, I don't think we really ever thought all that much about it.

Relationships just sort-of happened.

However, under any circumstances, my personal opinion would be, whatever the cause, it's not because you don't love yourself deeply. I wish you well...