It's intriguing to hear how you connected this phenomenon to under-stimulation, where your social reclusiveness and lack of engaging activities at school may have led your brain to compensate by creating vivid imaginary scenarios and people.
Daydreaming, to some extent, is a natural and common human experience, and it can serve various functions, such as providing an escape from the mundane or offering a way to process emotions and desires. Your account sheds light on how changes in our environment and daily life can impact the frequency and intensity of daydreaming.