Very few people (if any) will realize their full “potential”. At anything.
You do the best with what you’ve got, and that’s the most you can really hope for. Another day of living is always a win, anything else is just a bonus.
There are no doubt many treasured memories and experiences you would have forgone in the pursuit of running, and you would be someone completely different now. There are probably many things that version of you would regret too.
There’s also the chilling thought that maybe that WAS your full potential. It takes more than physical ability to make a champion. There’s a lot of good fortune involved. Sometimes the stars just don’t align.
As it is, you still have the opportunity to do your best with what you have and see where it takes you.
Enjoy the journey, because that’s the real reward.