You know have control or don't have control?
I know that I am the only one responsible for everything that is under my control.
No one else.
In this life you can only control your own actions, so why not just.. Make the most out of it while we still can? =D
As for your question, it's not that I am too used to the Singaporean JC way of writing GP essays, i.e. to sit on the fence bigtime, but I'd say that you have a certain extent of control over your future.
Granted, there are EXTERNAL factors which may come out of the blue, which may throw your path off course, even turn your life topsy-turvy. But what one can do about it, most of the time anyways, is to make choices to steer it back on course, or as you see fit.
Of course, no one, not even you will ever know whether the choices you have made are the best, but it doesn't really matter doesn't it. Because time only moves forward, at least with the current state of technology. And not surprisingly, for the things you feel regret about - it's always on hindsight.