It really is a wonderful time to be alive. Sometimes we let our cares and responsibilities get in the way of appreciating that. But here we are with the wonders of technology, a peaceful society (well, mostly peaceful), and indoor plumbing! We live better now than kings did a few hundred years ago. Pretty amazing.
A wise man once said, "We cannot control the things that happen to us, but we can control our attitude." I don't know why I put that in quotes because it's probably not even close to what the actual quote is, but the gist is the same. I can't stop work from being busy, or the bills from coming in, or the kids from being - well, kids. But I can stop work from being stressful, or the bills from being depressing, or the kids from being frustrating. That's where attitude comes in.
A negative attitude makes bad things worse. A positive attitude can make bad things better (or at least not so bad) and helps to focus on the good things.
I choose to be optimistic. It doesn't make my problems go away but it allows me to be happy anyway.