Is it normal to have an adrenaline rush when thinking about fighting?

For many years (at least 3), I ALWAYS get an adrenaline rush when I think about fighting someone. I got one right now cause I'm thinking about fighting someone that has pushed me around. When I get an adrenaline rush, my heart starts pumping hard and I get really shaky. In general I get an adrenaline rush. I have only been in like 3 fights in my whole life. 2 out of 3 fights were a tie. I used to let people push me around. But now if someone f*cks around, I beak them off, and they beak me back, and ask if I want to fight and I make sometimes a legit and fake excuse for me not to fight. Then later on I think about fighting that person for real and I get an adrenaline rush. Do other people get this too? Is it normal??