How can I become very confident?

you need to do things that would make you proud of yourself. you could study extra hard to be top in a module in school. save and buy yourself a designer belt or something (if you can). that could make you walk confidently hence you talk confidently. what i mean is you need to take your time to make sure you look good every day so you feel confident. iron your cloths, clean them, clean your shoes, keep your hair tidy. I'm not saying you do not do that, obviously i do not know but that more time and caution to make sure you look good and smell good. because when you look at yourself in the mirror and you feel proud of how you look you would walk and talk confidently. if you a Christian like myself or of another religion, pray about this. God listens.