How to be a really good fighter?

Theres no muay thai or boxing gym any where close tome, but I really wanna learn. I'm already a pretty decent fighter, I haven;t got into a lotta fights., I know most boxing techniques, but, how can i learn how to win street fights and fist fights? Can you please give me some tips for defeating the opponent. Like, what if he;s really aggressive, and coming on to me fast throwing a loot of punches, what should I do? Also, what are some good combos for street fights, and how Do i make people fear fighting me? thanks