Why am I getting downed in a matter of 2 seconds, yet....

@itsNologyTTV To add to what others are saying, my best guess is the lag compensation.
Now, that could be because you're playing on a further ping site, which in turn plays the role of players not actually being where they seem to be by like 1 or 2 seconds so when you think you're hitting shots, they're actually missing.
Secondly, if you're wireless then you're at a huge disadvantage. Packet loss issues, sudden desync issues, etc...
Thirdly, it could just be that your aim is slightly worse than the enemies and they're getting the headshots more often than you. It could be their movement versus yours. There's so many factors that go into this. It's hard to identify the main problem.
What I can say is this... if you're not hard wired than make yourself hard wired if you can. I've noticed a significant difference when I did. I stopped lagging out in the middle of a fight unless it was server side. And movement is key, don't know if you're console or pc, but work on that daily and you'll hit more shots. I've found practicing crouch strafing behind small objects is a good way to practice. Now I mean Revenant behind a traffic cone kind of practice.... you wouldn't believe how well that works.... Best of luck to you and I hope this helps.