its practically impossible.
when you have no contact with man, you will be overcome by so much
boredom that it would actually turn u mad.
also take note of surrounding factors.
in the statement "no man is an island", the "island" refers to
somewhere that may not even have wild life, are you sure you can
eat grass for your whole life ?
my point is, humans need other human to survive. they cant survive
on their own. they had probably turn mad, we are social creatures
unless you tell me u got phobia of humans then differnt story liao
right ?