Can't implement my idea because it's too big

Hi!

I want to make a game, but I'm afraid I have unrealistic expectations.

I want my game to look realistic, feel immersing, and at the same time be a game worth playing.

The problem is, what I'm imagining is almost at a AAA level, and as a one-man team I can't really get to that level.

What do you think I should do? I like my idea but it seems nearly impossible to implement by myself.