Hello Parsley78: If you had a fourth choice here: D. All of the above... that's the one the Skeezyks would choose.
I recall, quite a few years ago, reading a book titled:
Lost in the Mirror. It's a book about Borderline Personality Disorder. Reading it, I became convinced I could have been diagnosed with it when I was younger.

I've been told BPD tends to burn itself out as a person ages. And, at this point, I doubt I'd be diagnosed with it. But I imagine that perhaps at one time I could have been.

It's just speculation on my part, of course.
There's certainly nothing wrong with self-diagnosis. I think we all do it to one extent or another. But I do also think there is some value in having one's concerns checked out with a mental health professional.

Anyway... good luck with your studies!