Why is it so hard to farm in midlane.

I swear, i'm trying to farm some S grades, but every game other laners invade my mid around 10-15 minutes and take all my farm so they can ''push faster''

As Annie i might be able to salvage caster minions by one-shotting them, but with Leblanc who has to wait 1.5 seconds for her waveclear, it's impossible.

It's always either top or botlane that either wins or lose a tower, and then decide to push mid and take ALL your farm.

Last game i had a Galio who preferred taking my farm while his enemy Nasus free stacked at toplane. Sometimes i roam and help my teammates get their turrets, only for them coming mid and taking all my farm.

I'll still win games but i get bad grades since i can barely get 150 cs by 30 minutes.

And there's no use telling them to stop taking your cs, since they absolutely want to push. Sure it's usually the best decision to push, but on the other end, i'm kinda sick of getting the short end of the stick. You roam and help your teammates and they get your cs in return...