I heard an editor at a conference say once that rejection didn't mean he didn't like you. It didn't even mean he didn't like your story. It might mean he thought it needed more work if there were structural, or even proof reading issues, or it might just mean that he didn't think he could sell it this month/year because he'd bought things in the same genre, or that genre just wasn't selling. It certainly didn't mean you shouldn't try him again with some other story, or try your story with someone else.

It's also such a big part of writing that I felt rather odd, and not quite like a "real" writer until I'd collected one. I had the good fortune to sell my first half a dozen efforts before one was rejected, which was obviously very encouraging, but I did feel a bit like I hadn't quite earned by credentials yet.