My parents have never liked my obsessiveness, either. But if you want to do psychology, you should. Hmm, maybe you could come up with a reason that you should do psychology. Making up stories regarding my interests usually works for me.
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"Of all God's creatures, there is only one that cannot be made slave of the leash. That one is the cat. If man could be crossed with the cat it would improve the man, but it would deteriorate the cat." - Mark Twain