I believe I'm overthinking about my crush

I have someone I like, a coworker. I find them absolutely gorgeous and everything about then has me captivated. I like them, not love. I've felt love but this feels more like a crush situation on my part.
Regardless, we go out drinking together with another coworker quite regularly. We're all friends outside of work. Now I'm not a very affectionate or touchy person. I hate people touching me expect for this person. They do it so often to me, leaning they're head on my shoulder, wrapping they're leg above mine when sitting. Sometimes just holding eye contact for longer than usual. Now my reason for overthinking is simply because I just can't hold eye contact and I don't physically make contact with people often so it all feels very new to me. I don't want to overthink about it because I know they don't like me like that but I can't help taking into consideration every single they do then thinking they do like me. I don't want to make a fool out of myself ruining whatever friendship we have by asking them if they do. So how do I stop myself from overthinking it all?
P.S. I planned on quitting this job at some point too. I don't want to date them, I'm just overthinking everything and want it to stop. Cause they're a great friend.