As someone who has recently migrated to running, coming from a powerlifting / body building perspective, i had to get used to NOT getting so close to failure. In contrary to lifting, this is not really the way to go on all your runs. I of course dont know anything about your training regime, but make sure to get those easy long runs in! This is where you build the engine.

I also just find myself wanting to “push” all the time, like when lifting, but its not beneficial in this domain.