Luckily I didn't discover Heinlein until a couple of years ago - I couldn't deal with SF at all until I was 17. It's ironic though because even though I was the librarian of a club named for his Doublestar, I didn't actually read my first book of his until years after that. I read and liked Stranger in a Strange Land a lot - need to reread it over the next year or so I think, though, to see what I think again.