Is my theory of life after death irrelevant?

I am 14 years old. I believe that when you die you retreat to your subconscious. Like a dream. And you keep repeating memory's and creating new ones by using your knowledge as a dream creator. I know this sounds ridiculous. But, it's what I think and nobody has proof nor the knowledge to tell me otherwise. Unless you have an accurate answer or intake on my theory. Thanks.