> I don't get angry enough.

Why is this a problem?
I mean, controlling our anger is very good, but reflecting it against yourself is bad.

Anger and a lot of other things are our basic instincts; think of them as a source of energy - as a nuclear reactor is; if you don't control them, the result may be a nuclear explosion, but if you repress them or reflect that energy against you, it's like swallowing the same bomb. The right thing is to "control" this energy letting it flow outside ourselves by consuming it (in a sport activity, in our daily work, etc...)

> I used to have a problem with anger. In elementary school, I beat up some of my best friends.

I, too. But when we were kids, we had stronger instinctual reactions.

> Last night, we talked about how I am always sad, how I seek sympathy from others. She was right. I wallow in self-pity and try to manipulate others into feeling sorry for me, then revel in the attention it brings me.

Ok. Everybody of us likes to have other people's attention. Everybody of us needs to feel "good" and accepted in his society. Also this is a part of our instincts, like anger.

Now, let's change something. Instead of asking for sympathy and calling out for other people's attention, why don't you try to give sympathy and attention to other people? I mean, istead of "asking for", why don't you think about your personal way to "give to"? You'll find that, really, what will happen will be an exchange (of sympathy, attention, etc...).
It's a really good way to feel good.

Two final sidenotes:

1) Never ask "why" or "what's wrong with me" to the woman that broke a relationship with you. Maybe she hasn't an answer and usually what comes out isn't good at all. Ask that to your best friend, to yourself.

2) Don't insist anymore with Amanda. Take some space for yourself.

Back to work,
AP.