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I wrote the following:
我愿意告诉你我的故事，可是后来就跟米已成炊一样。
Basically, it was intended as a warning:
I'm willing to tell you my story, but afterwards I can't un-tell you.
My Chinese teacher indicated she understood what I meant, but gave me the impression the sentence didn't piece together well. I'm particularly keen on using the idiom 米已成炊 as I need some practice using them.
Question: How can I use the idiom 米已成炊 to explain this?
米已成炊 or 木已成舟 can't be used like the way you use them. They describe a situation where you can do nothing but accept the fact because something has already happened and there's no way you could undo it.
Usually, it goes like:
我已经把我的故事都告诉你了，没有办法再收回来了。 现在米已成炊了，我能怎么办呢？
Or
我已经把我的故事都告诉你了，现在米已成炊, 没有办法再收回来了。
I think my answer to this post Anyone heard a saying about marriage being like cooking rice? answered your question about when to use 米已成炊.
There is an expression "米已成炊" (rice is cooked) It describes "既成事實" (a realized fact)
When raw rice is cooked, it cannot be changed back to raw again. Old Chinese thinking considered marriage is permanent, must be treated with caution. If a man and a woman get married, it is like raw rice boiled to be cooked rice-- It is permanent, cannot be undone. The only option is to eat it, meaning accept it
~
In the past, if a man and a woman had sex, they had no choice but to get marry. "米已成炊" can also describe this fact.
As for 木已成舟, it can be used more generally for describing something that has became a "realized fact" and the only option is to accept it. e.g. "就像木已成舟一樣, 最高法院法官就任後就不能被罷免"，(Just like a tree had turned into a boat, once a Supreme court judge is appointed, he cannot be removed from his position)
木已成舟 can also replace 米已成炊 for describing "marriage is permanent"
When you said you want to give a warning before you tell someone something, I presume you meant that person might not like what he will hear. If it is the case, I suggest "別說我沒警告你，一旦我把事情告訴了你，你就不能當没聽過" (Don't say I didn't warn you, once I told you the story, you cannot pretend you never heard it)
I can't think of an idiom that mean: "別說我沒警告你" (Don't say I didn't warn you), but you can use an idiomatic phrase like "事先警告" (be forewarned)
