I think that just means you are taking your racing seriously. And it's an appropriate outlet for your "inner competitor", as long as you don't become cut-throat. Some people have that competitive drive, and some people don't. As one of those pre-race stressing, kick myself afterward if I don't leave it all out there types (NOT to be interpreted as "good" or "fast" or anything like that), I approve.

Not sure about the anger part, though. If it is really just a strong drive to get out there and push, that's great. If it's actual anger, not so much. I encountered a guy in a ski race one time who wouldn't let anybody pass him (the trail was too narrow), even though there were several of us trying. Every time somebody would get out there and start hammering to pass him, he'd speed up and not squeeze over (which is proper etiquette) to make room. He was being a huge jerk - he said something like "as long as I'm in front, I'm ahead". Went on for quite a while before we all got around him. After the race, he apologized to somebody, saying "I don't know what gets into me". HE should not be racing. HE could not handle competition in a healthy way.

Have fun!