You didn't mention how long you've been at it but it is very common to hit 'plateaus' or just get really bored with the same old routines; especially if you've been doing the same trail at the same park.

Yeah, and that dread or reluctance can manifest itself as anxiety.

Why don't you try changing things up a bit? Try HIIT - interval running, like doing high speed, flat-out sprints for a certain distance, jog, or even walk, for another specific distance and then another flat out sprint - rinse and repeat.

You could even incorporate skip roping into it - if you've never done it before, you soon learn why boxers and other full contact athletes use it as an integral part of their training (PC needs a sweating emoji).

Live near a school or other facility that allows access to stadium bleachers? A couple of trips up and down those - also great for developing foot speed and agility.

Alternate days - one day is for a burpee/skip roping/plyometric box jumps circuit, the next session is for hill/stadium bleacher/HIIT - believe me, not only will you loose your anxiety about leisurely jogs in the park, you will start to look forward to them immensely!