Every embarrassing thing I’ve done or will do, everything I’ve fucked up or will fuck up, eventually it won’t matter.

This comes much earlier than the heat death of the universe.

As we get older, the people who were present and aware of these embarrassing fuck ups not only has bad memory of their own, but these people pass away and with them, the only repository of the embarrassment ever happened remaining is ourselves. You will likely live to be the only one alive that know these embarrassing moments ever took place. Don't continue to torture yourself when you're the last witness.