i can't stick with one stinking idea!

i keep idea hopping with my books.
i don't actually know if there is such a thing as idea hopping. . .well, there is now.
i can't just stick with one thing. i get 3 pages into a book, and i have some bigger and better idea about a different book i could write.
but i feel like there're too many books out there, that i might steal without realizing it.
i guess i'm just really uncomfortable with my writing.
every time we have to share our creative writing with the class, people always like it, but i still feel really sick and worried. i don't get why i'm so selfconcious.
maybe because, even though i'm pretending to be someone else in my writing, its basically a shot right into my mind, because what i FEEL goes to my writing, even if what i think isn't.
it makes me feel vulnerable, and i hate that feeling.

who am i?

Who am I? No, really, who am I?
i have no idea.
well, i have some idea. i know my name. i know my likes and dislikes.
but deep down, what do i know? what do i want to do with my life? am i college bound? maybe, maybe not.
i want to be a writer. thats all i want. i don't want to make it big, but i want to be PUBLISHED.
it doesn't seem like a lot to ask, but it kind of is. if no one likes your books, what happens? it doesn't get published, and you don't accomplish your dream.
i feel like writing helps me find myself. it really does.
what helps you find YOURself?