~ He who loves his work never labours ~
When you were in kindergarten, you couldn't wait to enter elementary school. When you reached elementary school, you couldn't wait to be in high school, then continue with your tertiary education and finally, get to your dream job. It turned out to be a nightmare as it was different from what you had imagined since young.
It's a choice to take joy in one's work. Start each day with a goal in mind which is to make your working hours a joyful one. There are many who envy your ability to get into the position of where you are today, but instead of appreciating it, you've been complaining about it and always thinking that the grass is greener on the other side.
Enjoy what you're doing now and you'll find that there's no better joy than having your work secure in your hands.