Changing job

I’m planning on quitting my corporate job next month. I’m excited since I don’t like it anymore, I’m burnt out, and I have been for a long time. My husband thinks that I will definitely feel happier once I’m out of this job, but I keep going back to the model. And if circumstances are neutral, shouldn’t I be just as happy in this job as I would be not in this job?

I get that my thoughts will change when I quit. I feel an immediate sense of relief, caused by thoughts like:

I’m so glad I don’t have to go to work.
I’m so glad I can go to the gym when I want.
I’m so glad I have some space to breathe.
I’m so glad I don’t have to travel as much.

How can I believe those thoughts now? That doesn’t even make sense since I DO have to wake up and go to work and I CAN’T go to the gym when I want because I have to work, etc.

I just don’t understand how I am supposed to create the feelings I’d have when I accomplished the goal, before having accomplished the goal.