You can Google "proper running form" and get a ton of resources. I do think learning good form at a younger age helps, perhaps in a similar way that learning a second language is easier.
My running form improved greatly, and quickly, when I ran barefoot (or wear 5 finger shoes). Doesn't have to be far, could be a few hundred meters as a part of a warmup. If you're overstriding, slamming your forefeet or heels, it'll hurt. When it stops hurting, you're running with good form.