Honestly, I don't think it's your looks. I don't know what you look like and looks are a factor in dating for sure, but it's smaller than you may expect. At least with people you should want to be in a relationship with. I think it might be because you are fed up with things atm. I've always found that very easy to sense in guys, even when just meeting someone, they treat you differently. the body language is different etc. I've dated prettier and less pretty guys but rejected everybody who seemed to think similar to this straight on.
Now I don't know why your last relationship ended. But apparently, she didn't think you two fit together properly. That is not necesarily your or her fault. Just means you gotta find someone who is better suited for you.

If not that's good, I was replying to the bit where you say yourself that you were fed up as well as the part where you start to wonder if it's your looks. Not really sensing anything, that's easy in person, not so much in text.

Honestly, I don't think it's your looks. I don't know what you look like and looks are a factor in dating for sure, but it's smaller than you may expect. At least with people you should want to be in a relationship with. I think it might be because you are fed up with things atm. I've always found that very easy to sense in guys, even when just meeting someone, they treat you differently. the body language is different etc. I've dated prettier and less pretty guys but rejected everybody who seemed to think similar to this straight on.
Now I don't know why your last relationship ended. But apparently, she didn't think you two fit together properly. That is not necesarily your or her fault. Just means you gotta find someone who is better suited for you.