Doesn't sound to me like you are useless. You manage to go to college/school despite how hard that is and you usually work aswell!
It does sound like you are beating yourself up for being poorly. You are human and you are feeling ill right now.
Be gentle with you.
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Pegasus
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“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein