To be very frank nobody can give you exact answer...
A proper guideline would be...
It is you only who will have to find reasons for not giving up,it is you who will have to be with you when you are falling, your inside should scream not to give up.

this few lines should help you...

Sometimes you might just feel tired, feel weak
And when you feel weak, you feel like you wanna just give up
But you got to search within you, and try to find that inner strength
And just pull that shit out of you
And get that motivation to not give up, and not be a quitter
No matter how bad you wanna just fall flat on your face, and collapse

and there are many motivational lines, movies novels etc; which will help you hold your strength not to give up.