He Hit me First!

But he hit me first!
Does that make it okay for you to hit?

But, she wouldn't give it to me!
Does that make it okay to yell?

But, I don't like that food!
Does that make it okay to be ungrateful?

But, I am more qualified for that job!
Does that make it okay to have self pity?

But, I want more money!
Does that make it okay to be unhappy?

Focus on who you are, and what you can control. Bad things will happen, things will be unfair, disappointments will come, but be who and what you expect of yourself anyway.