The one thing that you have that nobody else has is you. Your vice, your mind, your story, your vision. So write and draw and build and play and dance and live as only you can. - Neil Gaiman
Sure, not every day will be good, but there will always be something good about every day. Notice these things and celebrate them. Train you mind to see what's right. Positivity is a choice.
Beginning today, treat everyone you meet as if they were going to be dead by midnight. Extend to them all the care, kindness, and understanding you can muster, and do it with no thought of any reward. Your life will never be the same again.