The problem is thinking that you have no control, an awful meme that is depressing - almost the definition of depressing - and self-fulfillingly self-defeating.
The most powerful force in the world is public opinion in Western countries, especially in the US - that's why so many powerful parties invest so much to manipulate it. There are many entire news organizations, endless opinion writers/etc., influence campaigns run by everyone from corporations to political organizations to state intelligence agencies, etc. What are they all working so hard at, investing so much in, if it doesn't matter?
Public opinion is formed by you acquiring information (including mis-info or dis-info), analyzing it, and communicating socially with others about it. Because many others don't do that, and most who do just repeat from received narratives, if you do it - if you form narratives - you have even more power.
No single person ever accomplished anything - everything worthwhile has been done by humans in groups. We are social creatures, not lone wolves - that's how we operate; if you act like a lone wolf then yes, you will be mostly powerless. But if you act within a group, and especially if you act intentionally and intelligently, you have significant power.