Ah, OK. I had originally parsed your sentence as it sucks to feel that you're underperforming and your clock is messed up as two separate clauses. On re-reading

Ah, OK. I had originally parsed your sentence as it sucks to feel that you're underperforming and your clock is messed up as two separate clauses. On re-reading it, I can see that it can be interpreted as “it sucks to feel that you're underperforming b/c your clock is messed up”. Thanks for the clarification. I had upvoted your comment because I found the rest to be thoughtful and insightful.