Hi Lexi, and welcome.
You're going to be fine, even if it might take some time.
Have you spoken to a counselor at your college? There are adjustments that can and should be made available to you. I don't know what they all are, it depends on what you need. You shouldn't be trying to meet performance demands in a new situation like college. This would be different from therapist stuff, I think.
Re communicating with friends - can you communicate in some other way? something cyber, maybe? I tell people I have difficulty using the phone, and so far nobody's offended. I like email and people don't seem to mind that either.
Your perseverations (flatworms & Dostoesvsky) will probably get you qualified for something, eventually. Are you taking biology? You might be ahead. Find a biology prof and talk about it, ask where that kind of knowledge might fit in.
And as for Dostoevsky - me too! And many more, I should think. It's been a while since I read him, but tell me - what's your favourite? I was enraptured by Notes from Underground when I read it the first time.
The Brothers Karamazov is my favorite, because of the detail; I identify with Smerdyakov and Alexey. But I know and love Notes from Underground. It was the first piece I read by him and it left me in a sort of stunned reverie for days.