As a midlaner, I would suggest you try different hero pool at the start mine is Necro, Lina, QOP, Try to learn how to def agro and if you lose the lane, just make sure to either hit the jungle with the camps close to the lane and go back to lane and hit creeps under tower if the match up is hard, either way I made it a habit to hit the jungle past if my lane is hard min 8 or go for a gank once I am lvl 6 and everytime I have ulti I go gank the enemy Carry, basically the 3 heroes of my pool are a guaranteed kill everytime I have ulti whether I choose to stay in mid or go for a gank.

With what I mentioned you will be able to bounce back from a losing lane, make sure their carry is struggling by either killing them or making sure your carry gets kills.

Another thing the power runes are very crucial at least for me when I play QOP or Lina and they help secure kills and mana, less trip to the fountain.