My work has a kitchen with paper plates, paper cups, utensils, etc. I never take from the top of the pile. I always take the 2nd, 3rd, 4th, etc. down. Why? Because the top item has been touched by other hands. And I'm weird and don't want other people's hands on my stuff. I wash the plastic utensils before using them, too, because someone touched them to put them in the tray.
I also don't use the first square of TP in a roll in a public bathroom, for the exact same reason.
I have an obsession with Ticonderoga #2 pencils. I love the smell of them when they're freshly sharpened. I love how smooooth they feel when I write with them. I don't use any other pencils at all.
I don't like to be hugged or touched unless it's by someone I consider a relative or close friend. This has made me the joke of some of my coworkers in times of elation.
Did your mom ever tell you that you should have on clean underwear every day in case you get in an accident and the EMT discovers you're wearing dirty underwear? No? Well, mine did. And in my adult life, I've taken it a step further. My underwear and bra have to match ALL THE TIME. If I find a bra I love and matching panties don't exist, I don't buy it. If one of the set gets ripped/damaged, they both get tossed.
I wear jeans and hoodies a lot. Even to work. I feel completely out of place in a dress or anything dressy. Sometimes I buy dressy clothes in hopes of feeling better in them, but I never do. Comfort wins over style every time in my book.
I realized just how OCD-like so many of my quirks are. Whoops! Time to share some of YOUR quirks, so I don't feel so bad!