~ Confidence never comes from having all the answers; it comes from being open to all the questions ~

Have you looked at feeling confident in this way before, it may help you to open up your mind and to see the bigger picture.
Do not confuse confidence with being loud or extroverted or compare insecurity with being an introvert. Confidence comes from within. If you need to spend time alone to feel energised and peaceful then honour that, but do not hide yourself away out of fear. Believe in yourself!