Consistently getting killed behind cover

i do get a bit annoyed at this kind of stuff. people firing through a vehicle hitting me? people killing me so quick i didnt even shoot 1 bullet back when i saw them first! yesterday i got killed twice within a few mins but i shot the player 99% coincidence? nope... when they are loosing i get shot much faster so they can catch up. i loose all 50/50's and sometimes people kill me with a single handgun shot? im just like wow whats happened here i cant do anything right anymore.also matches get heavly one sided too fast..cant you just jump a couple of good players onto the loosing side to even it up a bit? when your 100 spawns down seems like opposition are mob handed round every corner. i give up sometimes and go and find a quiet corner rather than mess up my k/d ratio walking into loads of sad campers or repeated ambushes... ☺