If it is pre-determined and planned for us then the choices we are making are not our own are they?
Does it matter what choices we make if the end result is pre-determined?
The debate between free-will and determinism has been raging for thousands of years, and there are many websites devoted to it online. It is a very interesting read!

In summary, yes it is possible for man to have free-will (make decisions of his own free will) and for God to determine what will happen. Lemme know if you want some links. There is a few threads about it in the christian section.