I took an online quiz about Spanish proverbs which promised to tell me whether or not I'm "truly Mexican". As it happens, I'm not Mexican, so I did rather poorly.
At the end of the quiz, I was told: "La cagaste. Ni modo, a lo hecho, pecho."
I understand that "la cagaste" means something along the lines of "you fucked it up" (literally, "you shat it"). I have no idea what "ni modo, a lo hecho, pecho" means. Google Translate translates it as "No way, done that, chest", which is not very helpful.
What does "Ni modo, a lo hecho, pecho" mean?
Answers in Spanish are okay.