Just curious, what did you like about it that it changed your life. Did you mean the how it was shot (i.e. impressed by director's work), Jodorowsky as a person, his story how he worked on Dune with other people (the complexity, dedication, the obsession), or Dune itself?
I found interesting how Dune influenced all these other blockbusters that came after, most importantly Star Wars. It was also fascinating how Jodorowsky never actually read Dune. EDIT: that is not correct as someone pointed out by Nemcue, I (and others apparently) misremembered. It was both the financier, Michel Seydoux and the illustrator Chris Foss who hadn't read it.
Or say, why anyone thought Jodorowsky, based on his previous track record of making surrealist films, would be a good candidate to make Dune. I just don't see the obvious connection from "Holly Mountain" to blockbuster "Sci Fi" for the masses. Now, of course in a funny twist, David Lynch, another surrealist author, actually made the American (Universal Studios) version, and it was terrible I thought.