Ever feel like you are just lucky to have a job you don't deserve

Ever feel like you are just lucky to have a job you don't deserve I have a mild stutter (sometimes its really bad). I work as an analyst for a hedge fubd and it is a high pressure job. Most of the time I feel like I have a target on my back and am just lucky to be employed in the first place. So I dont ask for a raise and take all the shit that gets piled on me. Does anyone feel like this.