Sorry. You are Yotzei the Bracha that you make whether or not someone answers Amen. (And it’s not actually a Bracha Levatalah if no one answers Chazaras Hashatz.) If you want someone else to be Motzi you with their Bracha, then you are Yotzei even if you don’t answer Amen, though of course you have an obligation to answer Amen (just as when you hear any Bracha).
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