People like what they like, so if that's not your jam I wouldn't sweat it. That said, Moby Dick is perhaps a poor example of "literature" to start on if you're not sure you like "literature", mostly from being so long. If I might recommend trying Cosmicomics by Italo Calvino, or The Cyberiad by Stanislaw Lem, as they are easy to dip in and out of are nominally "sci fi" while still laying some claim to "literature". Lem and Calvino may lead you to Borges or PKD or Ursula K LeGuin or China Mieville - more genre artists that arguably aspire to being more than pulp.