I just lost a big dose of motivation what should I do (details)

Apologize for long read, but I hope it paints a picture of where I am at for you. Thanks if you do read it.

Last week our unit took the PT test. Our section had been exercising and training pretty hard for it. I even did some extra running on my own and even twice a day sometimes with the section.

I’ve never had any big issues maxing push ups and sit ups. Push ups I usually max before 2 minutes and sit ups I have got the rhythm down where I max pretty much every time. But the 2 mile run has been elusive beast for me. I have improved my time since enlisting overall, but seem to be stuck at 14:00–14:30 2 mile time.

Though at this point it seems I should be beyond this by now. Specially compared to how other aspects/exercises have improved. Like I should be able to do better everything seems it has. Been stuck here almost a year now if I am remembering correctly.

I guess my thing is especially this time, past months I ran fast and hard for what I can do. Every time we had sprints I put all my effort in. 30 – 60s I’d keep going. I’d chase the fast guys even I knew it’d hurt. I even went up to Alpha group for AGRs. Only to not max my run. Again.

Even changed my running form to prevent shin splits as I found heel striking seemed to be causing it.(Quite a bit of experimenting on my end) Which was a hassle to a degree, but well worth it…Calves really feel it at first to mid/fore foot strike.

Anyways all that said. It feels so defeating to put what I feel like a lot of effort into something only to see hardly any improvement. If none at all when looking at times. ( I do seem to be better at longer distances) Frustrating, annoying and frankly I am losing motivation. Hardly had any desire today at PT to push myself. We did some sprints and runs. I was like why bother? Why push it? Clearly not doing shit for me. I do know that kind of attitude is not good to have and yet it is how I feel.

I don’t know at this point what to do. Suggestions?