It helps to know rough timings for where conflicts first happen. You can filter out a lot of this posturing by having a sense of where the other team should be, given timing
For example, in B-tunnels on dust2 in CS:GO and 2. With a decent spawn point, the opposing teams meet at the stairs - favoring whoever was slightly closer. It may be best to simply post up, or push through
I've always been a mediocre shot compared to my peers, but my gamesense and calm nature has made me super useful on invitational teams
If you're into it, just work on consistency - the rest will follow