Work on volume without prior work on relaxation, posture and alignment.
Forcing the voice without sufficient breath support, often resulting in a breathy, unforced sound.
Voicing under pressure to increase volume, rather than using resonance to increase the amount of sound created.
Speaking at rather than to people. Not using direct eye contact and appropriate body posture to aid communication.
Exaggerated body posture, for example head jutting forward, finger pointing and jabbing and forward thrust to the body.
Go by these guidelines and you should be doing great!!!!!