Feel like I’m dumb

Hey guys, I’ve never talked to anyone about this but just generally in life I feel like as a 18 year old I’m very dumb in terms of knowing about the world, politics anything. I want to expand my knowledge and memory and when I try to learn about new things I forget it and I feel like I know nothing. When I have conversations with people my age I don’t have much to input as I’m not aware of much.

Please don’t attack me but can you please give me some advice on things I can do to understand more and learn more about just generally different things in life. I get told to read books but then I don’t know what books.

Please can someone give me recommendations!!