I'm going into my sophomore year in high school (15 y/o male). For as long as I can remember, I've been an avoidant type person when it comes to interacting with others. I'm really calm and tend to not act excited or be loud unless the situation really calls for it. I see everyone around me always laughing and having fun when I'm just quiet waiting for class to be over or whatever, so I'm scared that I'm not going to fit in. Me being quiet has actually caused some people and a few teachers in the past to think I'm mentally handicapped, which put an ultimate low on my self esteem. Also it's good to mention that my older brother suffers very severe social anxiety: so does my mom and grandma so it's been passed down to me.