Appreciate our lives?

I've always been told to appreciate what I have, a family, a home, a chance to be able to study. To me these things are pretty much a daily part of my life, and I'm left thinking what I would do without them...I know of some friends of mine who don't exactly have a complete family. I think of myself in their shoes and wonder how I would cope with it. The answer? No bloody clue. Yet I see them still enjoying themselves and I find myself kind of reflecting on how I behave. I'm so used to the privileges of daily life that I sometimes forget that not everyone gets to enjoy them. I like to compare myself with others who are better off than me(who doesn't?) and then lament about my own sad life...then I think of other kids/teens who don't even have parents, and have to make a living by themselves. I myself haven't even had actual work experience yet and I find myself complaining about the daily burdens in life. The moral of this story? Learn to appreciate what we have, and try to work towards what we don't. There's always someone in a worse situation than you.