Fear of missing out, or FOMO, is when you feel anxious or sad that you are not included in activities that other people are doing. It is a feeling that something exciting or important is happening and you don't want to miss it. It is like wanting to be part of the group and feeling jealous of others who can join in on the fun. It can be tough to deal with FOMO, but it is important to remember that no one has to do everything and that it is okay to miss out on things.