Actually the breasts give you curves and balance, but as they are implants, without those curves, your body would probably look too slim.
Very very slim people, often don't have large chests, because it is partly a fat supply aswell, so once their fat surpluses have been depleted, it often goes from the chest aswell.
Of course there are exceptions to the rule, sometimes very skinny ladies, do have large chests, but not that often.
When someone is too slim you can see it in their feet, legs, hands, arms, neck, face. All over often.
I suspect This is what people see. You can't see it, and the chest disguises it, but it may well visible to others, that just think you may be a tiny bit too slim?
Is that possible?