>>281985638
>>281984965
some of it is mentality. of course they'll be out of reach if you think they are
the key is drilling motions and recoil patterns into your body, learning how to use the best guns, and how to read the map. 
if you're having difficulty against the top players there are also counter strategies that are effective against their playstyles (playing patiently, crouching/flanking against certain headhunters, efficient smoke/flash usage, waiting for the rushers at good angles)
I could keep going on but, while ping advantage is an issue, all of these can help you out when applied correctly