There's a spectrum. It generally goes something like Hypomania -> Mania -> Psychosis. (Though this isn't very accurate in the general scheme of things; you can be psychotic without being manic, and mania often incorporates some degree of psychosis.)

It can be pretty hard to draw the line between a "go-getter, ambitious, type A" personality type and someone experiencing hypomania. I think a lot of people out there lead successful and fulfilling lives while commonly in a state of hypomania.