How does one become cultured?Watch
Oh, and one more thing (which is probably the most important and the reason why everyone generally has a shallow/surface level of everything): read the wiki for everything and anything that even remotely catches your eye.
Just push yourself a little bit to try something new and different. I'm not artistic myself (my 5yo nephew likes to correct my drawings!), but enjoy art, and whilst I was aware of artists like Pablo Picasso, Andy Warhol and Bridget Riley, I found I had a bit of a narrow view of their work (distorted faces; Elvis, Marilyn and soup cans; bright stripes, respectively). I went to exhibitions on them and it is incredible how much more versatile their work is.
Enjoy finding a whole new world!