i would agree with church the sensitivity your using is a little bit to high for you, turn it down 1 or 2 or when your getting warmed up turn it up one or two then go back to the original and it`ll feel a lot smoother, one other tip dont chase as much as you did, just call him out and try to get a better angle on him and get halp from a team mate. just some friendly advice for ya :)
if u didnt chase every 3 seconds and die you wouldnt have to come back. if you snipe some1 and cant get to them let your teamates finish the kill. dont chase and die like godsmercy said.