No matter what career you pick, it matters. I know so many people who are miserable with their jobs. They constantly complain about the hours, or how exhausted they are.
That's not how it supposed to work. God created each of us for a special path. It's about breaking our will to finding what He wants for us. When we are in His perfect will, it won't be miserable. Now, I'm not saying there won't be ups and downs. There will be struggles. The difference is having the peace of knowing you are fulfilling your purpose.
You could work all your life at something, but if you don't have passion is it really worth it? Why spend your life doing something you hate? Why do only enough to just get by when you could go above and beyond?
You make decisions everyday that determine your future. Are you going to make it count? How are you going to make a change? If you aren't living up to all you can be, change some things.
The Lord will perfect that which concerneth me: thy mercy, O Lord, endureth for ever: forsake not the works of thine own hands. - Psalms 138:8