A leader is born in crisis

[1]

I am torn within. My girlfriend has left me, and all my buddies seem like rivals now, as she is calling all of them, chatting with them on FB, maybe even dating them. I have no friends left. I hate myself for what happened.
— A teen in a crisis

You are already your greatest enemy. Why on earth do you worry of other small enemies such as your so-called rivals? Once you win over and dissolve the destructive streak within you, the other stresses in your life will count for nothing. It takes a crisis to rip off the veil of truth about yourself. When the world around you comes crashing down, who or what comes to your rescue?
All true leaders through the span of history were guys who, in a time of crisis, suddenly figured out that the whole of their personalities became available as one cogent fighting unit. This was in contrast to all others around them who panicked and tore themselves apart with negative emotions.
So it is said that a leader is never made, he is born. He always had it in him, and he sharpened himself more and more with every crisis. And so can you.
This is the challenge of your life. No, not this girlfriend issue; the enemy within issue. This has to be understood carefully and practised diligently, so pay attention.
Since you can never normally know whether you are a friend or foe to yourself, you need to start off by exploiting every small panic situation in your life. This is your playing field where you allow the hidden truth about yourself to surface.
So now that your girlfriend has left you, use this chance to learn more about the way your mind is tearing you up. Observe your reactions; write them down in a diary with time and date marked on it. In a few days you won’t feel so bad.
You will feel relieved, but if I were you I would feel greatly disappointed. You have lost a wonderful opportunity to figure out secrets about your own reactions. You have lost the chance to see those parts of yourself who are your enemies.
Do this much. Twice a day, just write down how you feel. Take time off to observe yourself. Note how you swing from depression to hurt to anguish to violence to tears to just feeling bad.
These are all parts of yourself, which will ensure you will never fight as one person. These are your true enemies.