What you've described is an unenviable position in that you're dealing with a second order emotion, to paraphrase what you said, you're dissatisfied with your own dissatisfaction. That can just send a person around in circles endlessly. You might try just doing your best to not think about whether or not you're having fun in your work, try to avoid watching the clock or procrastinating, just thing about doing your work well. You'll likely enjoy it more that you are right now.

If you're able to and not already exercising regularly and getting enough sleep, I find both these things put my work in a totally different perspective. I was chronically sleep deprived and not exercising enough in my 20s and I was often in a bad mood and rarely felt much awe about anything.