One of the best ways to stay optimistic when times are tough is to focus on what you have instead of what you lack. If, for example, you’re going through a really difficult breakup, instead of focusing on the things you’re going to miss about your ex, make a list of things you have in your life right now: good friends, a steady income, unique talents, a cute pet, etc. Gratitude is one of the best tools for overcoming any difficulty and it’s particularly useful when things aren’t going well.