How will you get over this?

I always fear about my intelluctual . I feel fearful about what i convey is correct or wrong. In my mind , i feel blan about what i need . I feel very inconfident about what i tell. I feel more distant to people around me. I think down more. I dony adopt to change. I feel that i need to be make decision on my own. But i am double minded. I dont make my life to better. I become more and more fearful to show myself or present myself to others. (http://others.im)In my mind i feel i am not confident in understanding wht others say. I dont have gut instincts also. I think lack of it makes it worse.I am always fearing my boss. Due to that i left my job. I dont smile at people. I feel more lack of confident in me. And i am an introvert too. I dont speak much.