Ok, the humans and apes thing...someone help me...!?

ok, I understand right that humans and apes may have evolved from a common ancestor... BUT i'm just struggling to understand why there are so many kinds of apes and monkeys but only ONE 'type' of human...hope you're getting me so far...if we went through evolution.. erectus and all that and ended up as sapiens, why oh why arent there different kinds of human running around!! what happened to them? why didnt they make it to this point? are we as far developed as human can get..!? surely if theres many types of monkeys etc there must be different types of human...we can't be the only ones to make it this far..what will happen to us now! more branches off the evolution tree?? HELP!