find a better job

nowadays with my current job but i have to say that haven´t done much to find any other one. I noticed i give silly excuses to myself to apply to find another job like “i won´t be good enough” or “i can´t do other thing” or even “i already have one, why go through the trouble of trying to look for another one” but the truth is that i cannot stay where i am any longer. So, i have started preparing my Cv and my application letter and as soon as i finish my holidays i´ll start applying for something better (hopefully). Actually that´s the scary thing: how do i know it will be better??