Tell me that we are biological organisms

I've watched a series where in the future the consciousness are transferred to computers to reach immortality. This has caused much physchological harm to me because I can't imagine the suffering we can do to people with this technology. I now have a feeling of emptyness, I loved nature a lot and I've always thought I am an organic and natural result of evolution. My parents have tought me that everything in life has a start and and end, that death and illness are natural processes, and I accepted that.

So now I can't live my life thinking the opposite, that nature laws allow us to be replaced by silicon. I can only live believing that we are biological and organic constant changing humans, I can't live thinking that we can turn into machines, this feels so horrible and hopeless to me.

My common sense is that the ideas depicted on this series is pure reductionism of the nature laws, wished by people not accepting their own death and willing to live forever, even if it's in silicon. I don't have biological knowledge to contrast this information, so this is why I'm asking to you. I appreciate a lot your reply, my head is spinning around and I can't stand this feeling.