Fear-of-missing-out is typically a social anxiety that "others are having fun without you", but it also applies as a financial social anxiety that "others are making money without you".  You are most likely suffering from this anxiety to a certain degree (a lot of us are!)...  But you decide how much you want this anxiety to govern your life.  Enjoy the fact that you are a unique person, and enjoy your life experiences, and try not to worry about what everyone else is doing.