If you want an introduction to the history of visual art E. H. Gombrich's The Story of Art is the classic text and takes you up to about the 1990s.

Apart from that - go to a decent gallery, find a theatre production that looks interesting, go to a classical concert, contemporary dance performance or ballet, see a jazz band. Find a friend to share the joy / boredom with. Bonus points if they know something about what you're going to.

Honestly the best thing is just to explore and give yourself licence to like things that aren't fashionable and dislike things that are.