A terrible mindset...that I can’t get rid of.

For few months now working out has been stressful for me. I think of it as a chore and I sometimes dread working out. I used to love being active and playing sports, but now all I can think about is how many calories I’m burning, and that I should push myself harder. I’m just sick and tired of thinking this way, but I don’t know how to change. I wish working out made me feel good again mentally and physically. I used to feel so energetic and even though I work out regularly, I feel like every week I get more and more tired and less motivated. I try to push myself by doing super hard HIIT and strength, but I’m just starting to hate it. If you can give me advice, please do.