so young, yet so much anger

Find your core beliefs about what you're angry over. I'll give you an example of why I'd be angry if someone cancelled on me.

internal thoughts-
rasnfrasnbricknbrackn! they cancelled on me! so? so?! I've planned this and that I have to change my plans blablabla! so? SO?! it's a pain in the rear! I wanted to yadayadayada! so? so- it's just plain rude. rude how? It's rude b/c they aren't being considerate to me. not considerate how? they aren't caring about me.

oh, so perhaps in my past there's something to do with people not caring about me. Often anger is to avoid pain "now" due to a hurt in the past that we learned from. Get it?

I too get angry when a friend cancels on me but lately I try not to let them know. I feel like if I let them know it makes me look infantile and its kind of embarassing and pathetic. I always get angry with my girlfriend as well. Today she told me she was going to call me before she left for school and she didnt. Now this is the second day in a row that she did this. I know its not such a big deal but I was depressed and angry for hours because of it. =(