I actually can think of one good reason to ask this question, but in a context that makes the question
much harder to ask.
The way I read your post and follow-ups, OP, it looks like you're asking, "Is something wrong
because the schools haven't contacted me?" i.e., "Is it possible the school that accepted me made a mistake?" This is looking for
external explanations for what's going on.
The much, much harder (and more emotionally mature) way to ask the question involves rephrasing it, "Have the schools not contacted me
because something is wrong?" i.e., "Is there something
in me that made 7 out of 8 schools look elsewhere?" That's looking for
internal explanations. It's much harder to do because -- if done sincerely -- it opens you to learning things about yourself that you'd rather not know.
The second way is the way
every one of us should respond to
every rejection. The answer will most often be, "No, there's nothing particularly wrong with me, this is just a really competitive field." But it may also be, "There's something about me that actively derailed my application." And since you'll go through several more application cycles in your career (the first being for residency), it's worth doing an honest self-inventory to see if there are problems that should be addressed.
I rather suspect the answer is simply that you only applied to 8 schools and receiving a single acceptance, as
@Goro indicated, is par for most matriculants. But if you're feeling particularly reflective, and if you're emotionally secure enough to do an honest self-inventory, you can go ahead and examine yourself more thoroughly. You may find stuff you don't like, you may not. If you do, the immature response is to fret, panic, obsess, and become depressed. The mature response, for which we should all strive, is to pick yourself up and address the problem.
Best of luck.