I'm really glad that you form connections easily with other people. In a natural at it, its just maintaining it. Im like a mayor. I'm a horse that's great out of the gate, but not much on the long stretch.
No, don't allow your self to think that way. Fix in your mind that you are a good person who deserves to be in a healthy relationship, and if this isn't the one then this could be the one that teaches you how to do that. You won't feel that way right now, because of the noise, but truth is that people with even very debilitating emotional disorders have healthy relationship with neuro-typical partners. The only thing is that it's up to us to rise to the challenge. You have to make your self believe that.
I sometimes, think I might have ADD. I have some markers. I have trouble focusing sometimes, but I do when I need to. Then again I've also had two major head injuries so who knows what got shaken lose up there. Anyway, look, you are doing ok. Just keep going. Things will feel different in time. Also, go and look for positive stories. It's natural to drift towards misery, but it's the inspiring stories that will lift you up.