If you are one of those people that can’t hardly see over the steering wheel, then yes, the airbag is dangerous to you. It will smack you square in the face instead of the chest as they are meant to, and can damage your neck. The other factor is weight. You need to weight enough to cause the air bag to compress when you collide with it. If you are so light that you bounce off the airbag, instead of compress it, it can break your ribs.
Well, I’m 5’4”, and my 12 year old son is 5’5”. We are both quite slim.
I just tell him to keep his seat all the way back, to not lean forward, and to stay buckled in. I read somewhere that no child (non infant) has so far DIED (injured, yes) via airbag as long as these 3 conditions are met.
I like having one kid next to me as I have 4 kids and when they are all crammed together in the backseat they fight like dogs.