Lately Kassadin was getting nerfed here and there and with the latest base armor and armor growth nerf you can't win agaist any ad hero in the lane, i get it Kassadin is an anti-mage and is a counter pick but still even against most ap heroes (syndra,leblanc,ahri,zoe,diana,akali etc.) you still get bullied like hell and get pushed under tower but i see Kass high up on tier lists and win/pick rate lists. am i just bad ?
If you can't win lane, request your jungler, or try to get kills in other lanes. If other lanes are pushed past mid point and you can't really gank them, then ask your team to let the enemies push to allow you to do so. You're an assassin, if you can't dominate your lane, you will have to have focus on other lanes, or try to get your team to help you.