Can I say "I'm afraid to","I'm afraid of" or "I'm scared to"?

Question

Answer

Everything you wrote is correct except:
I am afraid of ghost.
The correct way to say this is:  I am afraid of GHOSTS (plural) or I am afraid of A GHOST.

Answer

I'm afraid to + verb > I afraid to go out / I am afraid to talk
I'm afraid of + noun > I am afraid  of ghost / I am afraid of going there alone
I'm scared to + verb > I scared to go out / I am scared to find out that he is not my good friend

Answer

I am afraid to go downwards to the dangeons of the castle, because I'm afraid of ghosts. And if I had seen  one, I would've been scared to death.