Fear of Missing Out (FoMO)

A pervasive apprehension that others might be having rewarding experiences from which one is absent.

Reference:
Przybylski, A. K., Murayama, K., DeHaan, C. R., & Gladwell, V. (2013). Motivational, emotional, and behavioral correlates of fear of missing out. Computers in Human Behavior, 29(4), 1841-1848. https://doi.org/10.1016/j.chb.2013.02.014