first off, i think as a general matter we would all run faster in practice than meets. it's comfy. you aren't tired. you know your track. i think it's really that we don't usually all out TT at our home base. we train. so we don't usually realize we do practice faster than meets. but to me it's universal. every other sport i am in you execute worse in games and the challenge is to execute less badly and outrun the others underperforming their practices.
second, a meet is just glorified practice. same length laps. similar track. just different faces.
third, closer i got to college i switched from running on adrenaline and rock music to meditating and stretching. you want to be relaxed and loose-limbed when the sprint comes. i had a whole routine where i just chilled out, even at the line to start.
fourth, one thing we would do in XC practice to get fire in the belly of the best is pursuit work. people go off every 30 seconds in reverse order of how good they are. so the others have a head start. you have to chase them down. it's not the usual space for good runners and it makes them have to think through fixing disadvantage as opposed to running off the front.
if the coach won't do pursuit, maybe take the occasional interval or two, throttle down a little to start, sit back with more of the pack -- or even just a decent teammate -- and then tactically take off at the end. you need at least some practice that feels like the race will go.
along those lines, maybe your race plan is premised on front running that is easy at your HS but not how a serious race will go. you then need to sit down and figure out how is it that you, in particular, can win those races.
to be clear, that is not pouting over the heat sheet and how fast people are, or fussing about the crowd watching you. that's you take a few races right now, try different approaches, and figure out out how YOU win tougher races. is it front run? is it sit on the shoulder in second? is it mess around in the back then pass everyone a la jakob?
time is nice but i'd focus more on winning my races. if you regularly win then the times will often come attached to that. how am i beating that dude next to me.