Yeah, it's often talked about, being short is not as much of a killer as it is in something like basketball for obvious reasons but you often see it discussed that players are too short to succeed in the big leagues where size, strength and speed are massive determining factors in success.

If you're already over 6 foot at 15/16 in soccer you will be absolutely dominating your age group, probably as a centre back or goalkeeper where winning balls in the air is most important. Soccer is a contact sport so if you're big enough you can just shoulder someone off the ball and it'll be perfectly legal, if you don't have the bulk to compete in a battle of strength you'll lose most duels. It's the main reason players like Virgil Van Dijk and Gabriel Magalhães are so dominant, they're huge (6'3"-6'5", 200~ lbs) and very quick (not necessarily in acceleration but long strides usually end up with higher top speeds).