The great thing about Fortnite is there are so many different combat opportunities. In close range situations such as running through a house or infiltrating a fort, pulling out a shotgun is smarter than just running in with a rifle out. In 1v1 situations, you can spend your time jumping around to make it harder for your enemy to hit you, or you can stand still and try landing your shots to eliminate your opponent as quickly as possible.
When you’re in a fight and start getting hit by a different opponent, make sure to build around yourself and then push to one opponent. If you don’t commit to fighting just one player, you’ll inevitably become pinched in an unfair fight.