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To thine own self be true. Assertiveness is difficult to learn, the truth is that you do not have enough life experiences which build your own inner fortitude. I would highly suggest doing something which is competitive, sports builds tons of confidence, but also another great thing you can do which is recommended by many successful people is to get involved with a toast masters and practice. Practice makes that 9 as they say.

Good luck in your efforts to grow it is encouragable to learn to be assertive and exude confidence, You Can Do It.