I have currently 313 battles. What should be expected from me? I feel like i'm the worst player that there is..

Pretty simple, started playing this game on 8. october this year.. currently on Bismarck, Amagi, Mogami.. i mostly play T6-T8.. but i feel like i'm ruining the game.. so my question is; what should be expected from me? As from a player with 300 battles. Thank you for your answers.