Something I've thought a lot about lately is why people and relationships/friendships/working relationships are so frustrating to me. And the conclusion I've come to is that I don't know what I think or how I feel about people or stuff probably about 95% of the time. Especially new people.
Basically if I don't outright hate you then there's probably going to be a period of time in which I'm trying to sort out exactly which box(es) in my brain you belong in. For this reason I think other people have a hard time figuring out me as well. People like to know where they stand and I'm sure it's difficult when I'm cycling through warmth and indifference (hopefully I'm never outright cold unless I hate you and that's probably not going to change).
I'm very much a typical introvert in that I loathe small talk so I dread situations where that's the expectation. Like on break at work when I coworker tells me, "I don't bite" and all I want to say is "I know, but I do." Maybe I don't like people at all today. Maybe I'm hating that everyone took their break at the same time as me and I wish I had gone to the other breakroom because I really wanted to be alone. Maybe I'm having some really complex feelings and thoughts about you in particular and being in close proximity is very much not helping me decide what it means. Maybe I'm relieved I don't work with you on a regular basis anymore because my stress levels have dropped significantly since you switched shifts. Maybe I think you're too cool to be my friend. Maybe I forgot your name *again* and I'm super crazy embarrassed that you've never forgotten mine and you can remember the name of my cat and where I went to school and how long I lived in Oregon.