e-shy
A person who thinks the internet is a big, loud, and judgmental classroom. He's too scared to speak up because he's afraid he'll say something dumb and everyone will laugh at him like he's a failed science experiment.
Tweet: 'I posted a meme. Now I'm waiting for the teacher to call me out.'
DM: 'I can't comment on that post. My brain is dead.'
Caption: 'I'm not hiding. I'm just trying not to blow up.'