I can't play this game anymore

I know this is gonna sound like bullshit, and usually i would think so, but its become so blatant and consistent i cant take it anymore:

A double standard. What do i mean?

Just had a game where i FULL shotgun hit a skulk center mass hit, and he gets away. Weapons 1, so i figure, bad luck or carapace or something. Then i play skulk. I come across a marine with a shotgun at the OPPOSITE end of the hallway (the long hallway from terminal to courtyard on docking) and i get killed in 2 shots (first bringing me down to 7 health) he gets 2 off because i stuck around to parasite and figured a shotgun at that distance wouldnt be insta lethal (relatively early game, definately not weapons 3). I bite marines multiple times yet i cant seem to kill anyone. And im not a newbie to this game, or shooters in general. I know how to aim, i know I am hitting my targets. so dont tell my L2P. What else can i do if on my screen i am hitting my targets? ALl i can think is hit recognition is wonky. I play mostly on the kahuna servers. I just cant take it anymore. And i cant suggest a game to friends if i dont enjoy it myself. If anyone else is having this, it could hurt the community