As long as you're looking on the bright side of things you'll be ignoring the not-so-good things in your life. What you give attention to grows, so if your focusing on what's wrong in your life you'll just get more of it to focus on. But if you focus on what's right in your life, what makes you happy, what you're grateful for, and why things are so fantastic for you, you'll only get more of the same to be happy and grateful for.
Some days are easier to face towards the sunshine than others, but it's always there, you just have to try harder during hard times.