When you tell someone your goal, you can experience what's called a "social reality." The mind is tricked into thinking that you've already accomplished the goal and therefore after you've felt the satisfaction from saying it aloud, you are less motivated to do the hard work to really reach the goal.
But wait? I thought you were supposed to tell your friends your goals? Sorry, stop doing it. Scientific study trumps conventional wisdom on this one. Look at this TED talk by Derek Sivers and learn more.
Resist the temptation to announce your goals. Delay the gratification. I know it feels good to say what you're going to do, but imagine how you'd feel if you waited until you'd actually reached it? Make no mistake, the mind can mistake talking for doing.
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