the thing which wil motivate u is CONCENTRATE ON UR ULTIMATE GOAL. what u want 2 b in final. at the end what u want to b keep thinking of dat when u feel depressed. think of this world as a challenge. u hav to prove that u r the only one who r gud in some criteria. there are many chances and not only single chance but take every chance as ur final one and work hard. while u r depressed then hear or see some story or movies which are relating u 2 ur goal, keep thinking that how did they do? nd do it urself.