I very much like what I am doing and overall have liked all the many different positions which I have held. I believe the key to liking what you do is being open to new experiences. Sometimes it might be the people you work with who bring joy to your day or possibly the location or flexibility of a job. It isn't always what you are doing but the impact of what you are doing that can make you feel good about it. For example, if you are a janitor, you can go home at night knowing that you have provided a service that creates a safe and comfortable workplace for others. Keep thinking outside the box!
With every good wish.