If you are tired or short of energy, you probably need to pay attention to your diet. That means whatever you normally eat. Are you eating the right kind of healty foods? Do you need supplemental vitamins? If you are getting the proper nutrition, then ask yourself if you are getting enough sleep at night. Do you get 6-8 hours of sleep? Next, to have confidence, you need to dress in neat clean attractive clothing. Some formal schools require a uniform. Some expensive restaurants require a suit coat. The reason for this is, if you are professionally dressed, your behavior will be appropriate. If you have nice clothing, you will walk more confidently and have better posture. Also, training can give you confidence. Your self-image can be changed by your experiences, education, and training. You are what you make of yourself.

First, look for cheering up things online! I love positive energizing quotes! Then there are many different ways to make yourself more confident like mentioned in other comments: give a look at http://www.wikihow.com/Build-Self-Confidence there are even more very interesting articles that can help you improving your self confidence a lot by yourself! If you just can't get it, look for professional help like a coach. They are a good mental assistance! facebook.com/your24hcoach Best luck with it!

My guess is, you can speek english - but it feels strange and you are not sure how well you would be understood. I see students become more confident right in front of me as they see that I speek right back and we comunicate fine. Just give it a shot! You will see.

stop thinking--and do something interesting or listen music,and think your self lucky that god give you a great life ,you are luckier then millions be positive always..it will suarly work and start this with a smile,you will see the fast effect :)

Always be calm and relax yourself dear.