Well . .I believe I will die at the time and manner decreed by God, so that could be considered fatalism I suppose.Basically it would be like if it's determined that Bill is going to die at age 63 it will happen no matter what Bill does. And it's possible that the only reason is that "it is written". The cause may be nothing, or it may be from a god. But there is nothing you can do about it. That's fatalism.
In Calvinistic determinism it may be determined that Bill is going to die at age 63. Bill finds out that he has horrible cholesterol numbers at age 43 when he goes into the the ER for chest pain. He discovers he's a walking time bomb and decides to loose weight, eat right and get in shape. He does end up dying at age 63. But Bill's changes in diet and so on truly and actually had an effect on lengthening his life. His choices were real, the effects were real, and his will was changed by forces and motivations outside himself. But he was choosing to do what he did. That would be more like a form of Calvinistic determination. You might say so what, he died at 63 still. Yes, but in this case his actions were real, had real effects, and his death was in the perfect will of God himself. There is a difference.
The question for the non determinist is this. Does God have foreknowledge of events? If the event happens did God allow it to happen? Could it happen differently once God knew it was going to happen without being outside of God's foreknowledge? Then was it not determined to happen? What really is the difference? I don't care if someone wants to reject Calvinist determinism. It is not related in any way to salvation, thank God. But sometimes free willers act like Calvinists are idiots who have overlooked some obvious point of logic when we are all in the same boat with these difficulties. It is humbling.
Bottom line, the only philosophy that is completely within our human faculties is either a random future not determined at all or we go on complete determinism. Anything in between is going to be hard for us to grasp.
I prefer determinism because I view fatalism as discounting human action all together, while predestination (determinism) doesn't.
So fatalism says our choices do not matter. But determinism (predestination) says the opposite (it is because God controls the future that we have the courage to act). We see this in action with Paul's words to the sailors urging them to remain on the ship (Acts 27).