I felt exactly the same way. A few years ago I realised how I was living my life without any purpose and basically just swimming against the direction of life current. Since then everyday I make an effort to know what I want from my life and how I could make it better. I read self help books and online blogs. I a try and be curious about the things around me and try to take up interests. My happiness level is not sky high right now but I believe it will take its time. I still do not find most things funny but the things that I do give me a good genuine laugh and thats whats important. Now I take joy in my struggles and have gratitude for it.
////"What doesn't kill you makes you stronger".///