I don't want to babysit.
What is your reason for not wanting to babysit?
I do not think I would be a very good babysitter.
If you truly think you're incapable of doing it, then that's fine.  It's healthy to be aware of what you are and aren't capable of doing!
I'm choosing to be a child molester, who assaulted his own child.
If you feel you are not suited to be a good babysitter, than it is a good idea not to become one. Taking care of kids requires a good amount of attention to be sure the kids are safe. If you are a child molester, than obviously you should not ever be taking care of someone else's child.