I recently went through a bout of depression, but was fortunate to have several people in my life to give me a wakeup call. Sometimes we can get so wrapped up in our troubles, that we either don't realize that Other people have their own stuff to deal with or we start to "disasterize" things.
The fact is that we control our lives and we control our happiness. For me, I was feeling sorry for myself and got wrapped up in my own emotions, not thinking about anyone else. I had several friends tell me that it's up to me to find happiness and that I control my life. I had a bit of an epiphany and realized that yeah, I don’t HAVE to feel crappy, I
can choose to fight and make the necessary changes in my life to become happy again.
One friend mentioned to me that some suffering is optional. This is very true. There were situations in my life where the depression or feeling down could have been avoided by simply cutting out the drama and making decisions that are ultimately, in my best interest. By choosing to avoid situations that will cause suffering, you maintain a happy state. It's all about making the right decisions and making things work for YOU.
Remember that everyone goes through struggles and low times, and it's easy to get caught up in ourselves. Just remember that you can make the decisions to be happy. You control your life. Happiness is there if you look for it.