Art, you amaze me as well as frighten me

I love art. I really love art. I'm at my happiest when I am drawing something especially when it's a cartoon character. Though I love doing anything that is related to art. With that said, when some of my friends ask what my major is,when I reply " I'm undecided" they are rather shocked.
This is understandable as one would think that I should major in art as well, but there's a problem. I am afraid to do so. I'm afraid of doing art for the rest of my life. I realize this is counter to what I've just said about adoring art, however I'm afraid of the uncertainty that comes with it. I'm afraid of putting myself out there.
I realize that just by majoring in art does not equal that I will I will necessary get a job in the art field. I mean I could do something completely unrelated like become a psychiatrist. Though there is a part of me who wants to do so, to do something that I really love.