I think that moves like yours test friendships and you find out who really cares about you and wants to be your friend. My husband says that people go in and out of our lives because we have something to learn from them or something to teach them. And then we all move on to whatever is next. Maybe the learning and teaching is done for a few of your friends. Or maybe they're wondering why you haven't called them. If you still have their numbers, you could give it a try. Either way, it's not silly to be sad. Sometimes it's hard to let go of something that is important to you.
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If you're not dead, you've still got time.