I am praying that God will make His will clear to you. Also, please know that there is nothing wrong with being quiet and shy. As someone who is also quiet and shy, I can assure you these qualities will not stop you from having an effective ministry. The gifts of the Spirit are not hindered by our personality type, and God can use someone who has a quiet, gentle spirit to make people feel at ease. Keep in mind that there are many soft-spoken pastors who are excellent preachers. In fact, my own pastor is an introvert, and he is one of the best preachers I've ever listened to. Continue to seek God's will for your life, and don't let other people's opinions limit your ideas about how God can use you in ministry.