Least important , most usual!

I don't know what u think, but I just can say with no doubt that almost every important things in my life, those that I just so depend on, are not really THAT important!
I mean:
Graduation? Not really!
Job? I can count tons of unemployees whom live happily!
Money? Yeah, it rulls! But I know people that were totally broken, but they just still living and carry on to their lives!
So then what IS important?
Family? Friends? Uhmm.. They're may be more important than the other things I count above, but are they really that important that we can't live without'em? I don't think so! I do love my parents and admire my friends, but sometimes I just think they're getting my way to be a person that I must be! I'm talking about social rulls that force us depend on our family and make us to try so hard to be accepted by our friends and society!
So then what is actually the most non-avoidable thing in human's life?
Like to read it from you!
:-)