Disappearing act

If something keeps happening to you situation after situation, you have to come to the conclusion that you're the problem, right?
Case in point, I met a girl at work and she seemed in to me and wanted to hang out after she went over to her friend's place. I say cool, call me.
She didn't call that night. I text her the next day and say fell asleep, maybe we can do something later today or tomorrow. I hear nothing back.
At this point I'm about ready to write her off, but I am an optimist at heart so I giver her a call. Voicemail. Joy. I leave a voicemail. No pressure, just give me a call when  you can, you have my number.
That was the day before yesterday and I have not heard a single thing from this girl. I didn't message or call her yesterday or today. The ball is entirely in her court. I will probably never see or speak to her again.
I can't even pinpoint what it is I did or said to her that put her off. I'm just not good with the beginning part of relationships where everything is so fragile. It was probably a comment that I would never think twice of saying and boom she's gone.
Or maybe I have a stalker that gets rid of any girl with the slightest interest in me. That would suck too.