collarbone breaks are supposed to be the least painful break. I've seen maybe 5 people get it, 3 of them didn't even know their collarbone was broken. The most painful is supposed to be the heel of your foot (according to a doctor), I bruised the bone on my heel and the doctor said it probably felt like it was broken due to its nature of being the most painful bone to break.
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.