What is a good alternative to "I was screwed"? [duplicate]
Solution 1:
First of all, it should be you're, not your.
You can use this more formal phrase: "You're doomed."
Solution 2:
Fix your "your/you are" mistake and do not use contractions in formal writing.
The answer to your question depends on how strong your statement needs to be. You could use a mild version You are in trouble, or possibly you are out of options now. The already suggested you are doomed is a bit more dramatic. As a threat, it could be replaced by you are finished.