Instead of saying, "fuck my life," when ALL of life can't be THAT bad, it is much more appropriate to use the phrase, "fuck my situation."
it makes a direct reference to a specific situation within a conversation noting that a particular event or series of linked event in one party's life are in fact terrible or awkward.
when you're walking to your car from your JUST established fuck buddy's apartment, with him and your other classmate who lives in the complex as he, says "good morning."
you say, "fuck my situation" or "FMS"
this is perfect for FMS because life is still good, you just got laid, BUT someone just noticed.