I know what it's like to live in daily unhappiness.  But, I think back to why I was unhappy in previous years, and realize I missed out.  Things were better for me than now, but I let disappointment about not having what I wanted bring me down.  
I missed out on being happy because I was angry I didn't get the life I wanted.  Of course I can't say this is so for everyone, but it is worth asking oneself how much we each are responsible for our own (un)happiness.