Is our future in our hands...or is it predetermined for us?

Up to a certain extent it's up to us. As philosopher Ortega y Get said, man has no essence, only history. Our ancestors only had their hands for their tools and yet they were able to survive the harshest winters and hottest summers... We still have that power, the power of choice. :) But it would be wrong to ume that everything is up to us, because there still are forces beyond our control, e.g. natural calamities, accidents, etc.