Your dreams may seem impossible to us, to others you might share them with. Nevertheless, no matter how impossible your dreams may be, don't let that stop you from actively going after them. Don't allow anyone (including yourself) discourage you from trying. You'll find your dreams will become your reality if you keep trying until you succeed.
Now, my dream is to not catch multiple types and colors of fish with my bare hands. But I have dreams that I'm going after, I've tried before and have failed, but it's up to me to keep trying if I want to achieve those dreams.
Losing weight, eating right, running a 5K, excising, hiking Mt. Saint Helen, could be examples of dreams you may have deep down inside of you. Its time to make goals that bring you closer to them dreams and start achieving those goals.