Not true. A collarbone fracture doesn't hurt bad, even a collarbone dislocation doesn't hurt too bad, gave my cousin one of each at the same time... A true collarbone break is very painful and hard to deal with though, my uncle for one will attest to this.
As for your heel, bruised bones anywhere hurt like hell. Being on your heel it would hurt a lot just because of the constant pressure it is under.
this post just... not worth the time