It Appears I'm a Tool Bag

I am well en route to the land of calculus knowledge, everyone may be pleased to know.  Also, it seems that everyone in the library hates my guts.  Not, wait, let me amend that.  Everyone in and around the library. 
Yes I am boisterous.  Yes I am loud.  Yes this can amplified when I am "studying" with one of my favorite friends who I never see.
However, that is no excuse, upon my leaving to get a drink, for some random chick who I do not know to plop herself down in my seat, and write on my stuff something about how she hopes my final isn't "too awful," hinting that I obviously would do horrible on it.
I walked back in just in time to catch her in her immature and mean deed, and let's suffice to say that I very nearly got in my first fist fight ever.
Then, I go out into the hall to make a phone call.  I am in perfectly acceptable phone call space, talking to my friend about the incident and having a good chuckle when some other douche bag gets off the elevators and glares at me as if I tried to eat her child.
What did I do!?
I do not feel that I am blameless in the first little squabble--yes I was being kind of loud and kind of obnoxious in the library, and I know that's a crappy thing to do.  But wouldn't it be more mature to say "Excuse me, wouuld you mind keeping it down?"
Plus there's always the option of studying at home or in the room marked "quiet study" at the library, because we all know there's always a big tool bag like me planted at a table just close enough to you to fuck up your day.
But anyhow, that's neither here nor there.
My point (did I have a point?) was just to say that I am loud.  I have a personality that...well, not everyone can take.  But I am fine with that.  No I do not condone being rude, but I also will not feel guilty for being who I am--a happy, happy girl--wherever that happiness may take place, whether it be smack dab in the middle of your study session or not.  If I  had known how much I was bothering that...girl...I would have quieted down.  But I like who I am, squeaky voice and all.  Loudness and overtness.  Over the top-ness as well.