What's wrong with me, bros?

First off, I'm generally not this mopey, just upset today. I was a late to come out, only after college, and I've never been in a relationship. I'm 24 and not getting any younger, and today I had a run in with a guy I went on a few dates with. He was great, seemed really into me when we first met. We went on 1 date, and then I hear nothing back from him. I thought it went well, but I really have no frame of reference. I ran into him today on MH (not where we met btw), and I tried to him about it, and he brushed me off again. And he's dating someone, so I just asked him what he didn't like about me just so I know what I need to work on. He said, "It just didn't work out."

Bros, I need some help. I'm tried of hooking up, just so I can be close to somebody. I know I'm not good looking, but is just a lost cause for an unattractive guy? I really don't want to be the guy that everyone want to go to the party with, but no one wants to take home anymore.

I promise I'm not this mopey normally, it's just been the worst day. I'm funny and confident, and I try to put myself out there. What am I doing wrong bros?