Someone I know was very confident in their teens.

A lot can actually happen in that time and it effects people in different ways and stages .I have never been fully confident but when I was younger I did afew silly things and did actually talk a lot more to people until I was bullied at the badest point and kept everything bottled inside and among other things .it was like I had a wave just knock all my confidence out of me I don't trust many people and so on it can happen if you don't wanna believe it don't but it can happen .