It is so easy to focus on the bad stuff. Like the people that are mean/rude to you. The horrible luck you have that leaves you with a flat tire, stuck in traffic, or when you lose a credit card. Losing a job. A break up. Etc. Etc.
Consider this: if you write down the good stuff that happens, no matter how small, you'll have a record to remind yourself of all you have when the bad stuff happens. It could be a gratitude journal as I have done. Or you can expand upon it further like a longer journal entry.
The lovely Gretchen Ruben suggests a "Milestone Journal." Another great idea.