Ways to being more confident when playing soccer/football?

Im a 15 year old guy called Harry and ive been playing for a football team for around 3 years. I have had many ups and downs but feel i am a good player who could go on to play professional. However the one thing that is lacking is my confidence. If i play a good game my confidence is high however when i dont my head goes down and whenever i see good players its as if i get kinda scared of playing against them. I play as a winger and im very quick, got good feet and can cross well. I still need to work on shooting and headering as well as tackling however whats really bugging me is how to stay confident for most games not all of them but most of them, has anyone got any suggestions on how to keep a high and consistent level of confidence?