NEWBIE

I am new to chess not exactly brand new but definantly a novice. I feel i  lack the killer instinct. I find it hard to recognize how to finish the game. I am afraid of sacrafice. I enjoy playing chess, I enjoy the strategy the concept of the game is totally fascinating to me. I have not yet developed my own style yet i have one a few games. I invite anyone/everyone to provide some insight as to what i am doing wrong and how i may better myself. Until we meet again....