Words to live by... for the single people

"When you relinquish the desire
to control your future,
you obtain happiness."

I have such a hard time doing this... I have to try so hard to stop controlling my future.
But really, doesn't that sound a little strange to you? I mean, we are always told that "only you have the ability to make our future as great as you want it to be." SO... if I stop trying to guide it in a certain direction, where will I end up? And how can they be so sure that I'll be happy there?