What are you talking about? Love knows no boundaries.
You're just WAY too picky for your own good. From your posts, if their skin temperature is off by a degree or two, that's it, they're out the door. It's no wonder you're single.
A relationship only works if there's concessions made on both sides. For example, do you think either Leo or myself view things as our perfect vision of a good life? Of course now, and I don't believe any married couple does. Nonetheless, we found our middle ground, and we listen to each other, and due to that know both of our lives and stronger and more enriched for it.
If you're not willing to give leeway when it comes to a relationship though, then yeah, I'd expect to be alone forever.