I'm not sitting properly on the bike.

Good evening. I have a Trek road bike domane aluminum frame size 56. I am 1.81 cm tall. I wear handlebar extension 100°. I am facing a problem, I have tense arms and my shoulders are shaking and my hands are numb. I have tried everything to turn the handlebars down or up. to raise or lower the handles. also if I move the saddle too far back my arms tense. if I move it forward I think my legs are not working properly. They told me to put a 90° extension and fix the saddle and it will fix the problem.

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