I can’t stress this enough: it’s a blessing to have so much purpose at a young age. Don’t waste it. It’s the biggest regret of my life that I did.
I was a good junior tennis player in a similar situation to you in regards to training and a sense that I was missing out in hanging out with friends. I had sponsors and coaches telling me I could go pro - I at least had the athleticism in spades.
At 16 I quit. It was a choice of going full time or sticking with school. I wanted to be able to party more, to be able to join the impromptu meet ups after school, to be able to even relate to kids when discussing TV shows or popular music, and to be a flat track bully playing school sports with kids who were a step slower than I was - to be a big fish in a small pond.
Around that time I also hit the jackpot with puberty and basically had 2.5 years of the most idealised ‘high school’ experience you could ask for. It’s overrated.
You approach 19 or so, and head off to uni (or whatever), and see other people finally trying to find their purpose. And, around the same time you’ll see the pay-off for all of those kids who had been that purpose young - through sport, the arts etc - and merely went through that period of ‘sacrifice’ 5-10, or even 15, years prior to everyone. You see the opportunities these people have, you see the drive and direction and you miss it.
In my case it was watching three kids I’d grown up playing with - none of whom were particularly talented - playing at junior Wimbledon. Then it was kids I knew growing up getting a role in a TV show, or playing for a professional football team. It’s continued, pretty much unabated, through my 20s.
The big myth about being ‘young’ is that it takes much time at all to get all the milestone experiences. The truth is it doesn’t.
You, as a runner - and through the sacrifices that entails - aren’t prevented from hitting the enjoyable milestones of high school. The parties all blur into one, as do the friends and as do the girls. I can’t stress this enough. It also feels a lot better - and earned - when you’re a student athlete and there’s more novelty to it.
It’s also worth nothing that high school hierarchies are fickle. Some people simply won’t be ‘popular’ due to the underlying social dynamics of being around the same people for years etc. I certainly wouldn’t bank on quitting a sport as being the solution.