I am Perfect... Or am I????

I honestly don't think I'm perfect, sometimes I am mean to people, and other times I'm nice. My problem is that I'm so used to people at school being sarcastic and thinking they are funny, but sometimes they don't know that they can be rude, or even if they're not trying to be rude it comes out like that most of the time, it makes me a little self-concious about what I say at school. I know that sometimes I can be like that too but it's mostly because I don't want anybody saying anything sarcastic to me because that really grinds my gears and gets me even madder than I already was!! But welcome to the life of high school!