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Yes if you're in pain or feel like you're going to worsen/injure yourself lifting with it. You're better taking a little time off it instead of lifting with it and causing yourself further...

It's definitely worth a shot to see what they can do for you, especially if it's bothering you that much.

Relax, rest and let your muscle repair? You don't have to be doing something everyday, especially as you're also doing other activity with football training and matches.

It's genetic, you may of just inherited a "short" gene. Who knows, maybe you'll hit a spurt soon, men are supposed to stop growing at around 21 so you may just be late.

You cannot really tell but...

I'd definitely take a multivitamin and still eat vegetables and fruits with meals