Im A 17 Year Old Boy..so Fat Since Childhood..and My

Im a 17 year old boy..so fat since childhood..and my fat is adding up time by time...and the worst part is my chest is getting oversized...i searched about it all on the internet which i could know was that bcuz of uncontrollable eating of junkfoods.is it true?....please help me ,i'm scared...im desperate to go shirtless..my friends are starting to make fun of me :(