I'd like to think I'm not self centered

I stopped by a store today. Once I was at the register, I set down my items. I was thinking about how hot Jennifer Aniston used to be when she was still on Friends. She was on the cover of some magazine, and I began to remember how I had a crush on her when I was a kid, and would watch Friends just to see her. I never really got the jokes in that show until I was older, but really I just wanted to see Jennifer Aniston. I've seen every episode about five times. Lost in thought, and completely unaware of anything besides Jennifer Aniston, I heard "Hey Bryan". It was the cashier. Sometimes I forget they exist and simply set my things down on the conveyor belt and let it do it's thing. Most of the time I don't even look at their faces when I give them my money. However, I always leave with a "thank you" and smile, as I've grown acustomed to do so, but don't really mean. I knew this cashier from somewhere, but I couldn't remember, I don't think I even tried to remember. I was just surprised to hear my name. I said "Hey, dude" since I couldn't remember his name, or who he even was. But it began coming to me, I knew him from my senior year in high school, I must have sat next to him in some class. I still couldn't remember his name or any conversation we might have had. This didn't surprise me, I forget most people within hours. I'm very self centered. "Did they ever call you back from Taco Bell?" he asked me. Who the hell was this guy! I applied for a job at Taco Bell a few months ago, and I'm pretty sure that I hadn't seen this guy since high school, how did he know about me applying there. I don't remember ever telling anyone about Taco Bell except for some girl I used to talk to a few months ago. "No....well they did, but I didn't get the job, it was for an interview, then I had a second interview but I never heard from them after that." I rambled because I was thinking about how self centered I must be to not remember this person. An example of my self centeredism would be how I was thinking about how self centred I was rather than remember who this person was. I think we exchanged about three more sentences, before I came to the conclusion that I am very self centered when it comes to guys and unatractive girls. I decided I would change in that moment, I wouldn't be so self centered anymore. So I asked him "So how have you been?"
"Good"
"So are you going to AWC?"
"NO I'm not going to school, I'm trying to save up some money so I could move to California." I heard a voice laughing in my head and saying "I don't care". I wanted to laugh. I managed to hold back and say "That's cool".He gave me my change. "Later Bryan" he said.
"Later dude" I said. I walked out of the store thinking about how I'm such a nice person and how I have so much to offer people.