Life is definitely fleeting, but we (or most of us) have to work in order to live. The key is finding work to do which doesn't feel like work, but the difficult part to this (for many people but not all) is making enough of an income to live comfortably. In this case, I would say it is perfectly okay and probably a good thing if your identity and your work are one.
It is crazy to me to think that so many people spend such a large percentage of their lives doing something (usually just for money) and don't consider it to be who they are, especially if they hate the work that they do. Your work is a huge part of who you are. It affects everything about your life. It isn't something you should do just to do it or because you feel like you have to. It's a path that people should choose carefully.
For way too long I latched onto the first opportunity or idea that came along. I'm 32 now and find myself constantly wondering how much different (maybe better, maybe worse) things could have been if I had taken a step back and considered more possibilities for the future. Now multiple times per day I try to consider where each decision might lead, no matter how big or small of a decision, ranging from hours from now to years from now to thousands of years from now. This mindset is less stressful/neurotic than it sounds, and I would suggest more people try this approach. Good, well thought-out decisions lead to a better future (for everyone). Imagine that.
That doesn't mean that you shouldn't take risks. Sometimes a risky path is the best possible path to take. The potential rewards should always be worth the risk, so that is something to always be considered. You usually learn a lot more in a shorter period of time this way.
Family is the most important thing in life. Material things don't matter. Sure, nice things are certainly nice to have and it can make life more enjoyable, but if you have no one you love to use these things with and spend your time with, life feels pretty empty.
Spend your time wisely, and try to do things that, when you look back on your life on your deathbed, you think to yourself, "I am so glad I made that decision."