Kind of like:
- not good at expressing oneself
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I think reticent may give the idea:
Inclined to keep one's thoughts, feelings, and personal affairs to oneself.
Cerebrotonic Designating a personality type characterised as intellectual, introverted, and emotionally restrained.
Reserved: formal or self-restrained in manner and relationship; avoiding familiarity or intimacy with others: a quiet, reserved man. 4. characterized by reserve, as the disposition, manner, etc.: reserved comments.
I found a reference once to Alexithymia in a biographical work and was intrigued by the concept. Wikipedia says: "a personality construct characterized by the sub-clinical inability to identify and describe emotions in the self".
After doing some research, it is actually a specific medical term used for clinical diagnosis: A person who might appear as an automaton in both personal and social situations. However, in the biographical work I was reading, it was used much more loosely. For example, men raised in broken families, perhaps in inner-city, survival-of-the-fittest environments, will have trouble later in life showing emotion, forming attachments and expressing love, and the author uses the word "alexithymia" in this context.
Stilted also a possibility:
(Of a manner of talking or writing) stiff and self-conscious or unnatural