Am I unable to deal with rejection?

Well, recently, this new dude started working at the office where I work. Initially, I didn't even flinch at the guy, I wasn't particularly inclined toward him at all; so I didn't really make conversation with him. Although, I did realize many times that he went out of his way to greet me every day.
So, one day I noticed the dude studies at the same university that I do, so I proposed that we wen together, he accepted and we ended up talking for about an hour or so. I have the impression that I annoyed the guy AF (I'm very talkative) and ever since I can't stop thinking about him...
I mean, he's not particularly attractive to me at all, I wouldn't ever consider him a good-looking guy, or even a remotely interesting/nice type dude... it's just something else. He's got an appeal that I don't quite get. I believe that the thing is that I feel challenged by the guy's attitude as if I have to convince him that I'm not annoying (?) trying to make him like me or something... It could also be that I noticed the guy isn't interested in me at all (as I was regarding him initially) and I can't handle rejection and I'm projecting it in the shape of attraction? I don't know, please tell me what y'all think of this.
Am I unable to deal with rejection?
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