This! Should be on top/pinned. I came to identical conclusion in my adult years, by stuttering from early age. Stutter person have struggles with talking, so he avoid it, then avoid social interaction, socialising. Sometimes people laught during school, so you even more stay silent, resulting in poor social skill, social anxiety, and it self repeating circle because you are weak in social skills, you are stuttering, so nervous how people would react, again you stay silent, missing potential friendship, girl/boyfriend.