where does one draw the line

I have made the mistake in the last week of vacillating and compromising my conviction not to let my roommate borrow the car. I had determined that, for many reasons, I was not going to let her borrow the car I am borrowing.  One of the main amongst those being that she is a grown woman who does not have a car of her own.

My only trouble is my wondering, "Who am I to be the one who drives home the message that grown people in our society, in our city, need to have cars!"...who am I NOT to just be simply generous and let her drive.  Who am I to judge differences between going to an office appointment with professionals and a trip to the beach?

Then again, is it right for me to perpetuate making it easy for her to not take responsibility for having a car.

Then again, is it even good for my own fortune to live in any form of selfishness and scarcity...is it not true that the only way to make good karmic causes toward having my own needs met is to do my best to be as generous as I can in meeting the needs of others...is "living in scarcity or miserliness" not one of the hells that poses and obstacle to enlightenment?

It does not feel right to deny her...yet it does not feel right to give give give in a way that makes it too easy for her not to do do do for herself...

Is there a difference between a need to go to an appointment and a want to go to the beach?

Can I, should I, be the judge?

You know though...her current stomping around the house making as much noise as possible in frantic random acts of cleaning, ever since I told her no about the car, is pissing me off a little...and her turning on a movie in the living room (where I am), then going into her bedroom and turning up music LOUDLY...all while she knows I am trying to work (or was trying) is beginning to PSS ME OFF

...and instead of feeling justified in being pissed...I feel like I should be more in control of my own mind thoughts and emotions than to let her "get to me"...

I really can't stand this state of being annoyed...I really need to LIVE ALONE...or maybe live with someone who wants to be living with me (for my company...because my presence can offer them some small comfort...because they know that their company offers me the same...like a cat or a dog, maybe)

I have learned things about sharing space with my first not family roommate...I am wondering if I have learned all I can here though...I almost wish I did not like the location where I live so much...I wish I felt it was easier to move on...