Abnormal =/= Wrong. Don't be hard on yourself. You're still discovering who you are and that's wonderful. I'm still doing that in my 30s and so is my wife who just got her diagnosis recently. It's a beautiful journey. Don't let comparison be the thief of your joy.
My wife, catching me in a stare, not even on my phone: what are you thinking about?
Me, halfway through another extremely detailed new board game design concept in my head (this time it's about improving our new Pokemon Monopoly): . . . A lot.
Which is to say in terms of advice, OP, that maybe your school would accommodate something similar depending on your area and parental involvement. It's part of her IEP, though I know some parents still aren't supportive enough to get the school to provide said accommodations, but it might help.
They let my daughter use the ear muff/gun range headphones with no speakers to dampen the noise of obnoxious middle school boys in her classrooms and now we have multiple sets at home for when anyone is overstimulated and always at least one in the car.