How do I deal with this kind of rejection?

You have worked hard and have so much to feel good about. Try to shut down your racing monkey mind that is thinking thinking thinking. It isn’t going to help one bit. There is no way to predict college admissions for the schools in the under 20% admissions range. Soon you will know what your options are and this difficult and uncertain time will be behind you. DD and I have been doing art together, walking the dog, savoring these first signs of spring. I strongly suggest doing something you enjoy. Before you know it you will know what your options are and then you can make your decision. For now breathe and feel proud of all you have accomplished.