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Marxism depends on the existence of free will, for without free will there cannot be revolution and social change.
You are very much misunderstanding Determinism, comrade. Determinism is less about worrying that the future is set in stone and more about understanding that the trajectory of the future is determined by the forces applied in the present.
There are of course many degrees of determinism depending on the philosopher. In western philosophy (which includes Marx) I think it is accurate to contrast determinism with free will. Marx and Marxism are often accused of holding mechanical-deterministic views of history in which revolution is seen to be inevitable in a mechanical sense. This is plainly not the way in which Marx conceived of history, in fact it is exactly the opposite. For example, writings like his Theses on Feuerbach, especially Theses 1 and 3, in which he criticizes the deterministic views of the mechanical materialists which neglect the essential role of human activity (free will).