I'm sorry to hear that you don't have any happy memories from your childhood. While it's difficult to determine the exact prevalence of individuals with no happy childhood memories, it's not entirely uncommon for people to have experienced difficult or challenging circumstances during their early years.
Childhood memories are influenced by various factors, including the family environment, social interactions, and personal experiences. Unfortunately, some individuals may have experienced adverse events, trauma, or difficult family situations that can overshadow or block out positive memories.
It's essential to remember that every person's experiences are unique, and some individuals may have faced more significant challenges during their childhood than others. If you feel that your lack of happy memories is impacting your well-being or mental health, it might be helpful to talk to a mental health professional or counselor. They can provide support and guidance to help you process your feelings and experiences and work towards a more positive outlook on life. Remember, it's never too late to seek support and healing.