A few thoughts:

Are your times now the same as they were at the end of last season or at the same time last season.

If you ran a hilly race in 85 degrees this year as you did a flat race in 60 degrees last year you are improving.

Perhaps your body is worn down and towards the end of the season, when the races matter (League, regionals, State) your times will drop considerably.

Maybe you are just listening to the split times too much. My best race in high school was when I decided to just keep up with the other team's #3 runner regardless of how fast or slow he went. I felt like I was jogging the whole time, then at the end, I passed the guy and beat him by 20 yards and had my best time of the year. This happen to be a duel meet so if I had a disaster and lost 45 seconds in the last mile, it was no big deal.

take a risk and try running with the person on your team who is usually the runner 2 spots in front of you. (and see how long you can last)

I would guess that you are running your training too fast.

Ease off on the paces in training and save the fast stuff for racing.

I run training around 8:30 per mile and race at about 6:40 per mile. A couple times a week you can go faster than that (but if you are racing once a week that takes care of one of the fast days)....never run fast for more than a mile at a time unless you are racing.