Preaching

Hello all, I am 15 years old and in high school and I want to know how I can preach the word and make people recognise Jesus, I want to know ways to preach and how to get out of my comfort zone and gain the confidence to speak to people and to not be ashamed of the word/Jesus. I just wanna gain the confidence to preach to people I see and to my friends and family, so please help me to gain confidence and preach.