The Snow On My Roof

This is what confuses me about the snow...why is my the house the only house with snow on the roof every time it snows?

It's not just a little bit, it covers my entire roof.  I don't have a flat roof.  It's curved at the tip top.  But, it always makes me wonder is it going to leak through into the house.  But so far so good.  But it's just so strange.

How do I get the snow off the roof?  Is there a little machine out there to remove snow, or I guess a leaf blower might work from the roof--but then I'd have to climb up there?  Help me..from a confused girl with snow on her roof?