Confidence is the belief in yourself and your ability. Never doubt that you can do something. Sometimes it takes practice and many tries, but if you work hard at it and believe in yourself, you can do anything!
Unless you have confidence, you will be plagued by doubt, worry and fear - all of which will affect your performance. You begin to doubt your abilities. You worry about your performance. You are afraid you won't make it. The beliefs that you lock into your mind tend to become self-fulfilling prophecies. If you convince yourself that you have the talent, that you can run 3.1 miles (or whatever distance is your goal!), then you will win.
Doubt, worry and fear affect your running in both a physical and mental way. They cause your muscles to tighten up, preventing you from running relaxed and loose. Mentally, doubt and worry will intimidate you. You become afraid that you don't have enough left in the tank to get to the end. This puts you on the road to defeat, not victory. With confidence, you become almost invincible. Have you ever watched a race on TV and noticed that you can tell who will win by the way they approach the starting line or the warm up before a race? Champions carry themselves with a calm self-assurance. They appear to be in complete control of the situation.
The root of confidence is positive thinking. Think of your abilities as potentially infinite instead of limited. Blot out words like "can't" and "impossible" from your thinking. Positive thinking is a magical quality. When you believe that something can be achieved, your subconscious mind will find a way to do it. Conversely, if you have doubts in your ability, you unconsciously will find ways to lose your confidence.
The second step towards confidence adds physical effort to mental effort of positive thinking. The effort may be hard, but there is no way to gain confidence without hours of dedicated practice which is what you have been doing for the last 6 weeks.
The third key to confidence is the ability to bounce back after a set-back. Everybody makes errors or has a bad run. Don't let them diminish your confidence in the least. Welcome the opportunity for a second chance and your confidence will grow.
The last step in building confidence is writing down your goals and fully expecting to reach them. Measuring yourself against your goal reminds you of the considerable progress you have made.
Be confident in your abilities. You never know if you can do something unless you try.