I read Moby-Dick for the first time when I was about 18, and have re-read it at least three or four times since. It is without a shadow of a doubt one of the most impressive books in Western literature, about ever so much more than the mere chase for a white whale.
It's about friendship, love, hubris, passion, the search for the meaning of life, etc. etc. Longwinded at times? Yes, definitely. Obscure? That too. Unless you're intimately acquainted with the Old Testament, Shakespeare, classical Greek drama and just about everything else in Western art it's a good idea to buy an edition that comes with ample footnotes.
But if you then take the time and effort this book deserves, it might very well be a life-changing experience as it was for me, that will sometimes make you stop and think for years afterwards.