One of the takeaways from this thread for someone like you could be (I certainly intended to put this idea out there) that you don't have to obey your high school coach. At my school the coaches only really 'existed' from the view of a student during the season for that sport. So track season started on some date (I don't know when that would be, but most of you here would; I'm guessing some time in March) and went until the end (May something?) Other than that, you didn't see him or have any contact at all.
Then some time in September cross practice would start on some day and that was the first time you'd see the coach for that. Different guy, completely unrelated. After the last race, that guy disappeared from your view. I suppose he was alive but he didn't have your phone number and may or may not resurface for cross next year.
Doesn't that leave 9 months a year to train on your own? And that's if you run both seasons. Now, as I posted earlier, it was extremely socially acceptable to run road races in the '70s and '80s. Parents didn't seem to have any disapproval to marathoning and actually drove us. Four 15-year-olds in the same car from the same school going to a marathon, probably during track season, must not have seemed weird at the time and no one tried to discourage it.
I don't think the track coach would have minded, either. I never met nor talked to him but one of my main training partners approached him Senior year and he was turned down. Looking back it's hard to say if I would have been welcome but since they didn't offer any distance events I never looked into it. During a later era, Brad Hudson apparently ran on his own; he was mentioned earlier. Verzbikas also did, but was actually coached, just by his mom and stepdad as opposed to whoever the school district hired.
So it sounds like you (poster I cited) had a reasonable situation but you're likely one of those who could have benefited from more volume. I'm guessing enough younger than I am that running unattached to the school was not acceptable according to peers, parents, and the school itself. I acknowledge that such is the state of affairs today and am lucky that it WAS considered cool 40 years ago.
I just wonder (being so removed from teenage culture I must ask) if school programs are year-round now. I suspect that wasn't allowed once upon a time. Either that or no coach was going put in a minute of work without getting paid, and they're only getting paid for 7 weeks. So is there practice through the summer? What about between cross and track? Isn't that 4-1/2 months? Is the coach for both generally the same at schools today?
I believe my high school track coach was one of the football coaches who needed a Spring semester gig and wanted to keep track of his football guys and make them stay in shape. (Not that unusual once upon time. OJ had to run track at USC.) Anyway, just trying to encourage those hoping to train differently than their school teams do. Get out on the road, all of you!