Difficult life.

Today while I was doing some work, a thought crossed my mind. The thought of why do some people just have a difficult life?
It's a very depressing thought actually. It sucks so much of energy just thinking of the question. My eyes move from left to right to left again looking for answers in my brain.
I was thinking, do we consciously seek for problems or problems are just there? Are we lack in something, like knowledge or experience? Do we know enough? Are we able to analyze effectively and come up with real solutions or are we thinking of quick fix approaches? How's our attitude? Are we pessimist or optimist? And can having a different attitude be significantly different?
How come some people can live with so many problems? Are they in denial? Sometimes I see the ones who are in denial seem to be happier. What matters here? Is it the results or the relationship? Sometimes we are so frustrated that we really feel to make tough decision but because of the relationship we hold back. At times, I observe how do some people can get to one problem from the other and look completely fine. Do they have the muscle? If the have the muscle, what is it call?
How do some people manage it? How do some people manage their time and efforts? Are we gonna be in more problems cause this current problems are still not solved yet? Do we need to solve all the problems?
Omg.. I can't think anymore.