I felt this way when I was younger. But, now that I'm older or old, I am more confident about myself. I think with life experiences and from your successes in life, you will build your confidence. You are not alone. I believe, as time passes, you will become stronger and more courageous. I know it feels miserable to feel as if you are not as good as everybody else. I suggest you do some hobbies where you can excel and talk to others about.