It's all well and good to strive for excellence, but excellence is about more than just putting in your 10,000 hours. Those hours need to be focused, deliberate practice. Without that, you'll be hard pressed to reach the full potential of your undeniable gifts.
Be warned: you can spend 10,000 hours of your life on anything, and just because you get good at something doesn't mean it's the thing you're supposed to be about in the world. I've spent thousands of hours doing things that I don't enjoy (and I got pretty damn good at them, too), because I thought I had to. I'm really good at a bunch of things I have no interest in, and that I know are not part of my great work on this planet.
If you're interested in digging deeper into finding your own great work, have a look at Stephen Cope's book "The Great Work Of Your Life: A Guide for the Journey to Your True Calling" on Amazon. If you've already got clarity on your calling, and you're ready to launch into creating a plan of deliberate practice, take a peek at the Get Your Year In Gear program. It just might help you create the space you need to do the things for which your future self will thank you.