Keeping an active mind has been vital to my survival, as has been maintaining a sense of humor.
Stephen Hawking said that his quest is simply "trying to understand the mind of God".
Remember to look up at the stars and not down at your feet. Try to make sense of what you see and wonder about what makes the universe exist. Be curious. And however difficult life may seem, there is always something you can do and succeed at.
It matters that you don't just give up.