Looking for happiness

I  work in a bank,  have a very loving wife and financially I am okay. I mean to say that despite having these things I never feel happy. I always feel like whatever I am doing   due to obligation. Like since I have the job that is why I work, I got married ,that is why I  love my wife. It is not like I don’t need these things in my life but I never feel like I m attached. Not only for these things, I never feel attached with anything. That is why I never put my effort forth honestly. Like if I want something new to do in office, I start with interest but with first problem in my way, I give up. I never fight hard to get something. In my life I have got everything easily. Now, the problem is I don’t enjoy anything and always feel like dissatisfied and unhappy. What should I do?