Impossible is Nothing... Muhammed Ali

The first thing to achieving anything great in life is to believe in yourself. Always see the possibility in every difficulty. Don't let your life be led by "I can't" but be motivated by "I will."
Nothing great was ever achieved by a pessimist, be optimistic about life. Don't believe it is impossible, just try and erase the "IM" and what you have left is "POSSIBLE"
Stay motivated, stay positive, make it possible.