Has happened to me quite a few times. Especially when I was younger. I realised that it was me holding back that was doing it. This was before I'd heard of MBTI. I made an effort to project myself more and found the problem went away.
As an introvert pushing yourself forward feels wrong in some way. Like you think you're all that... up youself you know? But when I did do it I found people found me less stuck up.?