Are You "Handling It"?

I always say that you're only given what you can handle and everything happens for a reason.
But how do you know you're "handling it"? What if you break down every few days? Would that be "handling it"?
And I'm one of those people that would prefer to know reasons of things..usually..,but not science reasons. Sometimes we don't know reasons and we may never know them about some things.. At least while we're alive..
What if you conflict with yourself?
What if you feel like a few different people?
What if it's like you think someone else changes personalities when..it's really you that's changes?
             ...Um, no quote I guess...
Sorry...