I tend to do this. It's just another excuse for me. While I have plenty to be thankful for, I still wish I had more. Of course, we all want more. If we had it all there'd be nothing to live for/strive towards as goals. As a metaphysics 'student' (i'm learning up on it, believe in this concept) I believe that our conditions are our choosing in which we derive certain knowledge and strength from. It's really hard to explain it and don't prefer to go into full legnth detail. But, we are in our own control, we are given the immutable right of free will to totally do what we want with it. And, uh..it's up to you to just take responsibility and on your way, be grateful for the good things you do have. You have more than you give yourself credit for. Materials aren't as great as nature's beauty, or doing something kind for someone else perhaps? Sorry to rant on, but, I hope you do find peace of mind.