WP you ask the most profound questions, but you already know the answers. They've all been re-answered for you in every single post so far.
What perhaps you may need to think about is not what you should do, but what you shouldn't do. Things that don't give you, or anyone else any benefit are the things that take up so much of your energy, preventing you from having the energy to do what counts.
Think of the professor with the jar full of rocks, sand, and coffee. You must put the rocks in the jar first (look after what's important), then the sand (what's less important) but always make sure there is room for coffee (or beer) with your friends.
It matters not what you do, so long as you do what matters, to you and your freinds and family. Mmost of all, as the old adage goes, "It's better to have loved and lost, than to have never loved at all." This saying goes for more than just relationships. Ever wondered what it would be like to jump out of a plane? Ony way you're going to find out is to actually do it. No one's opinion counts for a hill of beans, unless you actually do it for yourself.
Lastly, I tend to disagree with keeping yourself busy. More, keep your time full with worthwhile pursuits and make sure there is time to reflect, relax and think positively about your growing experiences, and what is important to your longevity. If you worry about dying early, you surely will.
Mick
