We cannot retreat in life.  We cannot live our lives twice.  So we take responsibility to our choices.  There is no need to regret.  Don't think that you can do it better if you have another chance because you do not.  Try your best for everything and take the consequences.

Well, no matter what the result would be, I decide to try depsratedly for what I dream of.  Some dreams are like bubbles, broken at last.  May be all the dreams are bubbles.  But I hope my bubble lasts longer and could dance in the air without fear of being broken.