Lets Compete

I have a vice that I need to overcome.  I've been doing this for as long as I can remember.  I have no idea where it came from and why I continue to think this way, but I do.  It needs to stop.

I've noticed that I'm a very competitive person.  Sometimes this is okay.  However, I find myself  being competitive in situations where there is no need for competition.

For example-

1. School

I do this in classes.  I constantly compare myself to others.  I look at their grades and if they do better, I get angry.  No matter who studied more, no matter who understands the material better, I get mad.

2. Acting

As you all know, in recent weeks I've gotten pretty into film club which has revived my passion for acting.  FA is also very much into acting so when I found out about different auditions I'd let him know about them.  Well, I've started realize how I'm secretly making every audition into a competition.  He may not know it, and even though it's impossible for us to be competing for roles (he's obviously male and I'm obviously female), I find myself in intense competition to do better than him.  I secretly hope he does poorly at all of his auditions and when it turns out opposite I get pissed off.

What is it about myself that makes me compare myself to others.  I've been doing this forever with my brother.  I constantly compare everything I've received in life to everything he ever got, which only leaves me coming up disappointed.

How do you change the way you think when it's all you've ever known?

How do you come to accept a change when you don't even know where your former behavior stems from?