As one of my favourite quotes starts, said by Edward Hale. And I do believe in it. We cannot be everywhere at once and we won't be anywhere at all forever.
But it's the way it is, so we should use our time wisely and don't waste any moment. Doing so we could appreciate every achievement we reach on the way, it will make a difference.
So discover the world, chase your dreams, be as clear as you possibly can with your directions, and don't lose motivation at anytime, not even a bit.