Is there any idiom that describes the following? Or are these natural?

You think whatever the fault is, I did it.
You think whatever the mistake is, I made it.

Question

Is there any idiom that describes the following? Or are these natural?

You think whatever the fault is, I did it.
You think whatever the mistake is, I made it.

Answer

Alternatives:

You think I'm (the one) to blame for everything.
It's always my fault, isn't it?

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Can’t think of any idiom right now, but you could say “No matter what happens, you always think it’s my fault.” This is very natural sounding.

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Some idioms :  You are trying to throw me under the bus.

Don't play the blame game with me.

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Whoever is at fault, I am always blamed.