Possible Clues:

• Social media-induced anxiety, for short
• Anxiety often addressed with the motto YOLO
• Anxiety about exclusion, acronymically
• Anxiety about not being included, in modern lingo
• 'I wanna be there!' angst (Abbr.)
• Feeling you get when all your friends are out having fun but you have to stay in and write clues for a crossword puzzle :'(