That's an unusual sentence. "It is entirely up to you" makes sense. It means "That is entirely your responsibility/decision", "You have to deal with it alone", "It's not something you can expect others to do; you can't delegate it."
It makes sense as a twist on the usual saying, in which it would mean that you must take responsibility for yourself, and not blame others when things go wrong for you.
Last edited by emsr2d2; 01-Jul-2014 at 17:33.