Anger?

after seeing shelvin's comment i had the urge to come here again. lolx.
but juz moments ago. there's was an explosion between mah parents. ==
they argued and argued and argued and argue.. ( u get the point..)

then i really felt fed up.
you are actually fighting over the smallest thing in the world that shud be tolerated. ==
who knew that u 2 were the ones who told me not to get angry easily. WTH..

then, someone appeared in my mind.
there was this friend of mine, a friend who was once real close to me.
we started knowing each other since January.

we got close eventually.
helping each other out and sharing joy and hard times.
there was a lot of good time.
times which i cherish alot.

but then in an incident which i had totally no clue about.
we started to become like strangers.

there was once when we were trying to sort things out with the organizer of the inter futsal competition.
they way they do things was just too much.
so i decided to act like i was angry.
because i know the PIC dun really talk sense when things are pointed to him.

since then , we became stranger-like.

after asking a few times i was told that my temper was bad.
at 1st i was confused and started thinking what was the problem. and then i started to be more aware of my own temper lo.
i was taught to not get angry easily again.

and ever since, we din really talked. more like i tried to talk but all i got was an empty reply.
when i ask about the reasons why this happened, all i got was " you wouldn't understand .."
then why not tell me so i could change???

then, few days later...
this friend got furious and shouted to the whole class. ==

i was shocked that i actually jumped. ><
then my mind was like " you told me not to be angry and now this? "

i really dun understand.
what gives a person reason to be angry?