Shyness

A personality trait defined as discomfort and inhibition in the presence of others. Shyness concerns the discomfort and inhibition that derive directly from the interpersonal nature of the situation. Not the same as social anxiety, nor a disorder. See also awkwardness.

Reference:

Jones, W. H., Briggs, S. R., & Smith, T. G. (1986). Shyness: Conceptualization and measurement. Journal of Personality and Social Psychology, 51(3), 629–639. https://doi.org/10.1037/0022-3514.51.3.629