As soon as i started playing css, i just did some grinding it out till i became good. If i just played noobs all day i hardly learnt a think, and didn't progress. Then i joined a clan and did loads of training sessions, which helps with game sense, and just generally understanding how the game should be played. It takes a while, but i think you'll be hard pressed to find a game you pwn at straight away. The only games i am naturally gd at are RTS and i still make stupid mistakes in those