I really really want to be a rapper when I'm older
Why do you want to be a rapper when you grow up?
I want to make a lot of money.
If that's your dream, I say go for it!  Without dreams and aspirations life would not be as adventurous.  You can do it!
Aww you're being sweet.
I'm being honest!  You should work to accomplish your dreams!  I'm rooting for you!