Human being can not be perfect because people can on few good as well few bad qualities. there are lots of ways for overcoming barrier. people can have good interaction with their society, they should become good learner, should develop their own understanding. i have explained some basic rule for overcoming barrier
1. Feedback
To overcome from barriers and communicate effectively, you should avoid misinterpretation and your mistakes by collection all the things. listen carefully to what other people say. when you become good listener people will understood you more and they will start listening to you too. if you have speech to be given in front of people on stage, then first try to mock that speech with your friend then try to correct your mistakes from feedback of your friends. by such things you can improve yourself and self-confidence.
2. Productivity
Your colleagues are moving forward, getting promotion and perform decreasing, that means there is lack in your productivity, you might be wasting time on some other stuff than you company want or you might not be understating the company's stats, motivation to work. try to you examine yourself, find odd things about you, plan your goals carefully(sometimes failure to achive goal make you loose your confidance), try to become more productive that will help you to overcome form barrier.
