I used to think that determinism was the same as fatalism. There is a difference.
Determinism is nothing more than the law of cause and effect. A determinist will know that their actions will cause other things to happen and will act according to what they believe will happen if they do something or refuse to do it.
Fatalism is very different because it means that what happens is irrelevant to what we do. For example, a fatalist might believe that they are fated to die at a certain time and that their actions or the actions of others make no difference in causing their death. If someone is fated to die on their 21st birthday. Then they CANNOT die before then nor can they make effort to live longer by healthy eating, exercise, or anything else.
To believe in fate is to deny cause and effect. Knowing this explains to me that it is not compatible with determinism. Whatever caused the fate would itself need a cause and therefore we are faced with the infinite past which we cannot fully know.
If fatalism were true, then you would be reading this post about fatalism even if I didn’t write it! Fatalism denies the very idea of relevance because it says there is no connection, relation, or link between events that happen in the universe. I don’t think anyone can honestly believe that.