Din't know what the manliest thing that I ever done, but there are a few:
At 5 or 6 years old I ran out from my grand parents bomb shelter in the middle of a bombing raid (shells were falling all around my grand parents farm) to save my grand parents talking black bird (got into a lot of trouble from my aunt for it).
At 6 or 7 years old I cleaned a 3 or 4 years old wound with iodine and bandage it up for her (it was a really bad cut, she lost 1/2 of the first digit of her finger).
At around 8 years old I sew my self up after a bad cut with my mom sewing kit and used iodine to clean up the wound (gave myself 3 stitches).
At 12, I was drafted into the army to stop Pol Pot from killing innocent people.
At 12 years old my family and friends escaped the communist in a 27" wooden boat (19 people, adult and children) that wasn't completed. the deck was open and storm/waves water was rapidly coming in. I was the only one that was brave enough to climbed out on the deck and sealed it with rope and tar (my dad was too busy with the steering, the young captain was useless because he feared for his life and his family).