"its a canon EOS 550D ..."
That is what the camera is. Not what kind of lens you have. But that info leads me to believe you have the standard kit lens?
I will also, now, believe the lens is toast. Sorry for that but likely it did not survive the fall. It is likely the repair cost will exceed or nearly so, it's value.
It still may be usable just not zoomable. Try it.
EB
EOS 1D, EOS 1D MK IIn, EOS 1D MK III, EOS 1Ds MK III, EOS 1D MK IV and EOS 1DX and many lenses.
