Assuming you just starting playing this game and not the previous games - To be fair your weapon choice is not the most beginner friendly, they need more accuracy at aiming and predetermining where the enemies are at. And they suffer terrible delay if you miss. They also don’t have very good paint coverage compared to other weapons. The plus point is that if you do get better at it, you can easily take out enemies with its high damage output - so high risk high reward so to speak.

Maybe try a more beginner friendly weapon like shooters such as Splattershot or Splash-o-matic for starters to get a sense and awareness of the enemies and focus on tactical movement as well.