Lowelo prob. How to farm better?

It's not that idk how to last hit. I have other problems. Pls read(especially of high elo) and reply. So. 1st of all while poking, I get distracted, and lose farm. I can't always freeze a lane. There are champions whose waveclear is so bad, that even when only lasthitting, my wave still will push it. When pushing then there are situations where I shouldn't be pushing(no vision/vision ward broken and such). Now when lasthitting it would make me push it which would make me get ganked. Give me cs tips pls
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