Enrico's Journal [flashback-y]

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I guess I should start this off by saying that I kinda need this journal. I'm not sure what's happening to me... well, if I end up dying from this, and a random stranger finds this journal, I guess I should give some information on myself.
My name is Enrico Salvatore, and I'm 15. Yeah, my dad's Italian, but my mom's a Croatian immigrant. I don't think I have any of their accents...
Anyways, I don't have any brothers or sisters at the moment, but one's on the way. We live in some small town in Minnestoa.
Well, I better get to the point. I was at a baseball game; it was my turn to bat. The pitch came at me, waaay to fast. That guy on the other team could pitch at 90-100 mph, so I heard. Anyways, for a mere instant, it seemed like everything slowed down. Not just one of those illusion things that athletes experience, because I was moving at normal speed at that moment.
What's happening to me?

It happened again, but in reverse. I was at the bus stop thus afternoon, waiting for a bus to come around. Normally, it would have taken about 20 minutes for the bus to get there, but suddenly, just as I was getting bored, things started to speed up around me. Everything except for myself, again. The bus got there in 3 minutes, speeding, or so it seemed, up to the bus stop.
Wait! I thought, willing everything to slow down. And just like that, it did. I felt weak and calm my as I climbed onto the bus. Was this weird speed thing tiring me out? I need to figure out what's going on...