Why do I say that?
Also if you know me, you know I have mixed views on the whole affirmation thing. I don't believe that constantly repeating "I am confident and good enough" are going to make you confident or help you KNOW you are good enough. (You ARE good enough, by the way!) Repeating "I am good enough" over and over is like slapping a fresh coat of paint on rotting wood. It may look better from the outside, and may convince some, but it doesn't fix the root cause and eventually you go back to what you really believe, which is that you are NOT confident, and that you are NOT good enough.
That being said, I DO believe that as a man thinks, so is he. I know it seems contrary, but it really isn't. The mind questions everything. That's what it is designed to do. If I look at a flower and say to myself, that flower is red, my mind will examine the evidence, determine if it is true or false and move forward with it's evaluation. If the flower is indeed red (or a shade close enough to be considered red) the mind says "Yes, it is red". Otherwise, it says, "No, that color is (insert whatever color the mind perceives it to be)." This is what the mind considers a static fact. It is or it isn't, black or white, yes or no. As cruel as this may seem, if I say to myself, "I am confident", and all evidence points to the fact that I am, in fact, not confident, my mind rejects this, saying "No, you are not confident." This will be the case, no matter how many times I repeat this to myself. Until I show the mind evidence supporting the fact that I am, indeed, confident. I am simply restating false evidence and the mind isn't buying it.
So what about better and better? Well, the phrase "better every day" or "better and better" are not static facts, they are moving forward statements. They have action. They have momentum. We are not stating a static fact, we are relaying information about an action. "I am doing this" The mind has a tendency to like this better and is much more willing to go along with it. Am I in a condition now? No, you are not. Are you moving towards a particular direction? Sure...maybe.
So what are you saying? I am saying that if you choose to use affirmations, make sure that the affirmations you use have action and momentum. Instead of "I am Confident", try "I am becoming more and more confident every day!" And when you do, follow that up with supporting evidence. Stand up straight. Lean forward when you walk. Move with purpose. Use definitive language, e.g. "I will", rather than "sure, ok" or "I think I will." Give your mind a reason to believe that what you are telling it is true! Look for the evidence around you that supports your desired outcome. We are convincing your mind that this is where we are going.