Cannot win 1 game in silver 4...
Finally got out of silver 5, and i lose every single game in silver 4....
Its like everyone got good all of the sudden past silver 4....
I honestly just need to learn a better champion
Is a pretty shitty champion to carry with. He is mobile sure, he can one combo people sure... But you have to rely on your team if they steal kills. You hit a point where you do no damage at all unless your team also knows how kassadin works and makes sure to let you take the last hits on kills you made plays for, OR lets you last hit a kill they dont need and feel you would be better off having.
I know this is how the game works with almost all champions, there is a point where you let someone take gold if they are a hard carry and fell behind in order to get them back in the game.
Some champions can focus farm and still have a great teamfight.
to name a few. They all have roles in a fight which can be played even when you have fallen a bit behind. They may die during the fight BUT they can accomplish something. Kassadin is one of the few assassins whom when you fall behind with have trouble actually playing your proper role of squishy assassin. He has an escape which will have to be used as your engage in MOST situations, but not all which leaves you out of luck middle game before your CDR is higher (as you have fallen behind at this point and lack items). Really it feels like his one chance to get back into the game is to finish off someone middle game who has one to three shot hp left.
Maybe he could use a buff in some regard that effects his catching up game as an assassin. Assassins are meant to feel very all or nothing, carry or feed. Just seems like kassadin feels too much that way, as his play % shows.

for some Mid lane champs. They offer a great deal of wave clear, cc, and damage output. Also, Brand's ultimate is great for team fights, and that will allow your other teammates to clean up if you die. Try them out, and I'm sure you'll get out of Silver 4.