Excuses for not writing

I'm not talented enough.
When I sit down to write, nothing comes out.
My ideas seem terrific — until I try to write about them.
Writing a book seems like an impossible dream. I'm too overwhelmed.
I'm too old to start.
There's too much competition.
I don't have enough money.
I don't know any literary agents.
If the book doesn't sell, I'll have wasted all that time.
I don't have enough time to write a book.

(want to be) Writers:
What excuses do you have?