There IS such a thing as a ‘fractured penis’, there are 2 chambers (one on each side) that fill with blood during erection, and a sharp blow can burst one or possibly both sides, which usually results in a noticeable bend when erect. I haven’t heard of it causing a shorter erection, but maybe that’s possible. See your Dr or possibly a Urologist - they can perform tests that will determine whether there was actually a fracture. Let us know what’s found…
Nobody here can tell you that. I doubt it, but only seeing a doctor will tell you that. If you did break it, which is rare, it would hurt, not be shorter when erect.