HELP! How to stop drawing giant heads!?

[SHIRUBA]

Basically, whenever I'm sketching a person, either in a realistic style or a cartoony one, the head always comes larger than the rest of the body! Afterwards, I always have to scale it down. It doesn't matter if I start with the body or with the head, it always comes out disproportionate. And it isn't just part of the head, it's the whole thing.

This doesn't happen with other body parts. The hands, feet, legs and arms are all in proportion to each other. It's just the head that comes out to big

Any tips to correct this?