These two dictionaries seem to offer translations for insecurity
that capture the physical sort, not the psychological sort (i.e., insecurity about your looks, weight, smarts, etc.).
http://www.cantonese.sheik.co.uk/scripts/wordsearch.php?level=0
https://www.yellowbridge.com/chinese/dictionary.php
Example sentence: What you react to, and what you're sensitive to, often reveal your insecurities.
1) In Mandarin, what's the best translation for psychological insecurity
?
2) What's the best translation for Cantonese?