Don't go into stuff with the aim of looking cultured. Rather with the aim of getting informed, to enlighten yourself. To experience the wonders of the world, and the fascinating aspects of life. Just put in a little effort to know stuff for yourself, that is what will help you keep getting into more and more stuff. Fill your social media with the good stuff. Like all the cool pages on FB, follow all cool people on twitter, join all the cool subreddits. Try to find your way into that culture.
If you're in a position to, maybe you should get diagnosed and get medication.
In terms of general advice, there is nothing wrong with Audio books. I think it was scientifically established that reading or listening to the book activates the same part of the brain. For music, just start randomly, visit forums, or ask people, and maybe the youtube recommendation algorithm will help you find something you like. Edit: One thing which got me into music were movie soundtracks. Maybe you can start from there
And always feel free to rant here.
Cheers comrade
I try. During those conversations only I had to hear such nuggets of wisdom.