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I agree with all the supportive comments about sticking with it despite your shyness/introversion. If this is what you want, you can definitely do it.
But it's also okay to quit if you want and do something else. Trying out new things is an experiment that always succeeds -- whether you stick with it or change course. You should be commended for going to J-school and trying something out. And it's ok if during that process you learn that it's not what you want.
I used to be a journalist and for the reasons you cited, as well as other reasons involving personal preference and daily happiness, I decided to quit and get a degree in a completely unrelated field. Like today's letter writers, my colleagues strongly encouraged me to stick with it and I felt bad at the time for being a "quitter." I was also haunted by the prospect that I was fleeing my fears. But I kept reminding myself that I was quitting one thing to start another - which isn't really quitting, it's just a change.
That was 12 years ago. I now have a degree and a job in a field I love. I no longer experience daily conflict and struggle as I carry out my work. I am at peace. I am not hiding; my work is challenging and stimulating. The pace and duties of my work suit me very well.
I think you can excel no matter what you do. I hope you do not feel like there is a "wrong" thing to do. Spend time exploring your fears and doubts and try to tune into your desire. Find out what you WANT and fight to make it happen.