Arthur Schopenhauer[who had a lot of influence in Nietzsche’s early years as can be seen in his writings] writes this on free will.
[…]Accordingly while our several actions are in no wise free, every man’s individual character is to be regarded as a free act. He is such and such a man, because once for all it is his will to be that man. For the will itself, and in itself, and also in so far as it is manifest in an individual, accordingly constitutes the original and fundamental desires of that individual, is independent of all knowledge, because it is antecedent to such knowledge. All that it receives from knowledge is the series of motives by which it successively develops its nature and makes itself cognisable or visible; but the will itself, as something that lies beyond time, so long as it exists at all, never changes. Therefore every man, being what he is and placed in the circumstances which for the moment obtain, but which on their part also arise by strict necessity, can absolutely never do anything else than just what at that moment he does do. Accordingly, the whole course of a man’s life, in all its incidents great and small, is as necessarily predetermined as the course of a clock.
He continues to say, and this is of interest to most people
that every man achieves only that which is irrevocably established in his nature, or is born with him.