To love what you do or do what you love, that's the question. Sometimes getting used to do what you are doing makes you forget what you love in the first place. The routine kills all the senses and you end up doing what you have to do without thinking of what you want. It's at this moment that life becomes just an existence, without the essence of life itself. There is a fine thread that defines it, that it's barely noticed.
If you feel that you don't enjoy any longer what you are doing, take a pause and think what you actually love and want to do. Life doesn't go backwards so don't wait for something that you might like to come to you, you might wait forever in vain. Every moment you spend doing things just you have to do are waisted moments. You have to pursue what you love and in order to do that, you have to determine what you really love.