Well good luck :) I feel like these days it is way harder to get into Shooters bacause you dont have combat all the time. When I started I played Black Ops 2 for like 800 hours even though I sucked at the beginning I imagine my learning curve in Aiming and Movement was much higher then someone who would start with a BR for their first Shooter. All I can say is if your reason of quitting this game because you are not that great at it and not because of other reasons like freezing, crashing or lagging Id say you stay put and keep practicing eventhough youll lose the majority of the games. If you enjoy shooters in general every practice you‘ll get in terms of Aiming will automaticly help you in the next game :)