Shout it Out Loud

In uncomfortable or new situations, which can often be uncomfortable, I find myself becoming loud and rather abrasive. Some friends might just say that this is how I am most of the time. Maybe this is true. I often find that I notice these qualities when I am looking to establish myself in a part of a group.
My friend's dorm mates and then later her room mates will probably agree to this idea if asked. I found myself viewed as a rather loud character and often excessive. I found myself in this position again, amongst people I had met on one occasion, and trying to be noticed. I don't desire to be in the spot light, because if I did then I'd be a lot smoother and much more congenial than I tend to be. No, rather I am sarcastic, abrasive, who gives a shit right now attitude, in short a less than desired combination of qualities when trying to make an impression and/or make friends.
Oops?
We can sit and discuss the psychological aspect of this, my inner dwelling of unsettled relationships, till we're blue in the face, but I feel (and this is in speaking not just about myself) that we must either grow up or live in our shortcomings. I can either let other's opinions of me, which by the way I have helped facilitate, bring about a change of character with in me for their benefit, or I can try to understand my outburst and show those people who I really am. And that would include the loud abrasive side of me, only coupled with those other various parts.
But then I also feel that people should just speak up for their own damn selves.
If they want to be heard over my loud cacophony of noise then say something.