I'm an introvert according to MBTI and have passed various aptitude testing for different aviation jobs. From talking to recruiters, for the personality quizzes they will 'scrub' you based on them for 1 of 2 reasons, either you are sooooo far down one end of a scale (either massive introvert or extrovert for example isn't great), this though is very rare, or they need an excuse to scrub you.
As long as you can engage an interviewer, look someone in the eye, shake hands and make a sentence or two of small talk, you shouldn't have a problem in the selection process because of being an introvert.