For a smoker, you sure are long-winded there ghost

To answer your question:
Whenever I feel like that, I just remind myself that no matter what happens in my life, the sun will always rise the next day. Feeling bad won't change anything, and life will go on regardless, so I figure I may as well make the most of it. Confidence and determination make important positive changes, depression and sadness do not.

Now I understand that a lot of people can't just convince themselves to feel better, but it has always worked for me. I'll always love myself, so that ability comes naturally.