Tense and annoying voice while trying to hide stuttering.

Tense and annoying voice while trying to hide stuttering. I have been told a lot that sometimes I speak too loud or like I’m “overreacting”. This always happens because sometimes I simply can’t talk and I need to make pressure in my lungs, thus my voice sounds very annoying. If I try to talk without effort like a normal person does, I stutter a lot. Apart from that, I start to have pain in my lungs due to the pressure, I don’t know why.