You have every right to feel sad, disappointed, frustrated, angry with yourself. This is a very stressful, difficult time in your life and telling you not to feel how you feel would be pointless and disrespectful. So feel it. Let it hurt. Give yourself some time to feel however you need to feel.
And once you’ve done that, realize that, as much as this sucks for you, it is in no way a reflection of your personal worth. There are three possible reasons why you’ve been rejected.
One is that your stats did not make the admissions officers confident that you could handle the coursework at these schools. If so, what does that say about you? Not a darn thing. Some of the smartest, most determined, most hardworking people I know–in fact, most of them–have lower test scores and GPAs than I do. Those numbers don’t in any way reflect their worth. They can’t possibly tell an outsider how compassionate, selfless, and infinitely willing to compromise my best friend is, nor can they communicate how hard my SO will work to figure out a problem, be it technical or personal. Both are amazing people I look up to and simple numbers don’t affect that at all. On the flip side, some people I know with very high scores/grades are significantly lacking in these qualities and are rather widely disliked as a result. That’s not to say that all people with great scores are squares and people with low scores are inherently more personable–it means that there’s really no correlation between these qualities, and you are totally capable of having fulfilling relationships with others, the world, and your future career regardless.
Two, maybe you had the stats and just didn’t get in because you weren’t a good fit for the school. Doesn’t mean there’s something wrong with you. Everywhere has a culture, and if you don’t mesh with it, you’re gonna be miserable. That doesn’t mean you’re a bad person or not good enough–it means the admissions officers were doing their jobs, making their class the best it can be, which means not admitting people who have a high chance of being unhappy there.
Three, maybe neither of the above. Maybe you were qualified and a good fit but just got unlucky. Admissions is a tricky, often random game these days, and if this is the case, once again, you should not use it as an indication of your personal worth.
So, to reiterate. Let yourself feel bad. It’s ok. But in a day or two, pick yourself back up and start looking forward. Look to the opportunities that these schools will afford you. Find out how you can make yourself happiest and set yourself up for success in the future. It may seem like the end of the world now, but this is really the beginning of what could be a rather wonderful chapter in your life.