No, it's not — at least not necessarily, which seems to be your implication.

One can be awkward and not be a creeper. One can be unattractive and not be a creeper. One can be a creeper and be neither awkward nor unattractive. And, yes, one can be all three.

The difference between them tends, in my (male, second-hand) experience, to be one of persistence. Awkward doesn't always stick around long past the point where it's no longer welcome. Creepers, awkward or not — and unintentionally or not — do.

EDIT: phrasing.