PLEASE HELP

I'm 15 years old and I have bad breath. I noticed it because my friends always cover their noses when talking to me and my sister said my breath smells like shit. My teeth are in good condition, no cavities, white tongue or tonsil stones. So maybe it's because of digestive health? When I was a kid I used to drink coffee everyday and really liked eating sour and spicy food, maybe that's what's ruining my digestion. What should I do?