Postponing Happiness

i have survived on the challenges that i had put on myself over the last 27 years of my life.Had them at each and every stage of my life and worked hard to get it. these have transcended from being things as silly as being the school topper to things as tough as getting into my dream company. and then even tougher ones, like getting into ISB.i am blessed to have been a self-motivated individual, i have always aimed for my dreams.and the realization of this also means, in some ways, i am an egotist. which is fine. in life, at some occassions, you need to be.but over the last few days, a few things have happened in my life which has led me to think a bit differently. i got bad grades in my first term at ISB. i worked hard in the next three terms and have managed to improve the grades and for this, there was a lot of hard work put in.but, then, what am i seeking to achieve here? another dream job? which i even dont know what it is, at this moment?things suddenly does not make as much sense as it had when i was 21 years old.or, when i had decided to quit and join the b-school.

alum wisdom tells us that the 2nd and the 3rd terms are the toughest at ISB.why do i feel that i feel more of the stress now, in the 5th term, than i had felt a few terms back? is it because something has changed?is it because of the thoughts which engulfed me in the last few weeks?
a couple of years back, in an 'art of living' session, we had this small exercise when we had to share the most important moments of our life with a stranger in just 5 minutes and this gentleman who i had got as a partner told me somethings on these lines.

"in life, i have always associated happiness with getting past some targets and i found that i was always postponing happiness. i had thought thati would be happy once i got good marks. when i got that, i thought i would be happy once i had a good job. once i had that, i thought i would be happy when i bought a car...etc...i was always postponing happiness......"
that sentence has stuck on to me and now, something has happened which brought back that sentence and i dont know what!
life is short and its only once. happiness should never be postponed.