There may be other factors outside the mental illness pathology that you may not have considered:

1. mild autism (as Ms Parson's suggests).

2. upbringing.

3. In astrology (I'm an astrologer BTW) if most of your personal planets are below the horizon - or between the first and before the 7th house cusp you're an introvert - or need to spend time alone to recharge your batteries so to speak. (Personal planets are - as you may or may not know are: Sun, Moon, Mercury, Venus and Mars).

4. Learning disabilities as a child and /or an adult that set-up behavioral responses that have created a conscious or unconscious defense mechanism in you.

5. Undiagnosed early life trauma (PTSD).

I worked 25 years in alternative mental health.

And, synchronistically I wrote a piece just yesterday that may be of interest to you: "I was Misdiagnosed as a Schizophrenic"

https://medium.com/know-thyself-heal-thyself/i-was-misdiagnosed-as-a-schizophrenic-47406430cdf3