The Reality of Life?

So I have been thinking that there are somethings that I just need to say right now...
One is that my expecations are never what they seem to be... meaning most of the time I have found it easier to little or no expecations for what is going to happen...because if I set my expecations high they are almost never met...but if i set them low or don't have any, I am completely and udderly amazed at how things all work out for the best, and can see both the good and the bad, but mainly the bad...So my question is, "how do I live life with low expecations...and not think negatively...To live optomisticly is that it?"
So when life comes down to it, I need to remember to take one day at a time, and never forget to stop and smell the roses and enjoy myself every once and a while and the people around me.