Learning from mistakes

Making decision under extreme condition is my work. I sometimes make mistake, and see the consequence of terrible chain reactions. I feel sorry. I do feel sorry that many people suffer because of my bad decision. But most of the time, I cannot undo what I did. All I can do is to take responsibility of the decision and try best to learn from the mistake. I wish I am getting wiser and stronger by overcoming all of these acute pains.

English grammar

For people using English as a second language like me, English grammar is sometimes far beyond from understanding. Why 'mail' is an uncountable noun while 'e-mail' is a countable noun? I can count number of mail you got if you are having any problem.