Hurting for what's it Worth

Seeing them happy, dancing in the air, taking life on cheerfully hurts me. Not because I can't be happier for them, but because I can't feel sorrier for myself. What am I doing? My emotional highs, my emotional lows, my seriousness, my challenges, my goals? Do they feel these too? And at such quickly changing pace as I do? How do they keep life so simple and why do I make mine so complicated? It isn't really worth it, is it? Then what is?