I know of no more encouraging fact than the unquestionable ability of man to elevate his life by a conscious endeavor. Henry David Thoreau.
I think about that a lot. That our conscious endeavors can actually change our life. Or perhaps our perception of life. Every single day stuff happens. It's not the great stuff I'm talking about, it's the annoying, frustrating stuff that everyone gets to deal with. I expect we all get about the same amount, equivalent to whatever our tolerance level is. Everyone's ability to cope is different. Things that you can handle easily might slay me, and vice versa.
However, it is our own attitude towards things that creates the life that we lead. Focus on the bad stuff and it becomes bigger and more important, until it takes over and becomes the center of our existence.
Focus on the good things and the same thing happens. Our perception of life becomes centered on what's good and lovely and right, and our ability to deal with the bad stuff increases. It becomes less important and less central to our everyday existence.