I wanted to be...

...a teacher. Realized how obnoxious kids are.
...an artist. Lost motivation to draw.
...a singer. Lack of star quality.
...a photographer. Too much competition.
...an actor. Stage fright.
...a zoologist. Don't like getting dirty.
...an author. Couldn't write past 4 pages.
...a manicurist. Realized I'm not THAT good.
...a journalist. Doubted my writing skills.

"Well then what do you want to be when you grow up??"

I don't know.
I just want to be somebody who does something worth while.