Use that to empower you to do the things you want to do. You don’t know how much time you have, regardless of age.
Also use your 30s to build habits that will help keep you active into your 80s. Resistance training, cardio, and eating right. I struggled with this until my late 30s and while I’m making great strides now, it’s a much harder fight in your 40s and 50s.
What makes you hate it?