Monster I Think

I was playing softball with my friends at our school. We traded places so that I was pitching. When my friend went up to get ready a truck drove by real slow. The truck came around again, and stopped the driver kept the truck running for a few minutes then turned it off. The driver was a guy. The guy came at us fast he had something behind his back. My friends, and I became worried I started pushing my friends behind me because I couldn't let that guy get near my friends even though I was, and still is the youngest I don't let anyone mess with my friends. I let the guy come toward my friends and me he then withdrew a weapon he tried to cut me but, I went sideways at the last second but unfortunately the weapon got my friends arm leaving a big nasty cut. I was so angry that I zoned out [means power is about to be used] I heard his thoughts they were nasty so I thought about the guy getting cut across his stomach. Then I came back to reality what I thought happened he stared at me then said freak I must have looked deadly because he ran faster than when he came at us. After I was sure he was gone I looked at my friend's arm I zoned out again this time thinking about healing my friends arm, and when I came back to reality her arm only had a little bruise. Next when I got home I couldn't help thinking that I was a monster for hurting that man but, a nice enough monster to help my friend. That night I cried myself to sleep [by the way I never cry] so next morning I woke with the cut my friend had on her but now and still is on me. I'm 13 and I think that I'm a monster.