* Fear of rejection. Some people worry about being rejected or ignored by their former classmates. They may have been unpopular in high school and dread the thought of reliving those experiences.
* Fear of change. Some people avoid their high school reunions because they're afraid of seeing how much their classmates have changed. They may be worried that their memories of high school will be shattered by the reality of seeing everyone grown up.
* Anger or resentment. Some people avoid their high school reunions because they're still angry or resentful about something that happened during their high school years. They may not have forgiven their former classmates for something they did or said and don't want to relive those negative experiences.
* Lack of interest. Some people simply don't have any interest in attending their high school reunions. They may have moved on with their lives and don't feel the need to reconnect with their former classmates.