I, Regulus Black, am a Slytherin, but not by choice. Although I was pressured to become a Slytherin by my family, I did not wish for it. They were sure I'd become a Slytherin because of my ambition – my name itself means 'little king' – but then again, they'd expected Sirius to become a Slytherin and he'd ended up as a Gryffindor. However, with me, unlike with Sirius, my parents were right; I became a Slytherin; no matter how much I begged the Hat not to put me there, it refused to listen.
I must admit that I was indeed ambitious – I always had been – but I never agreed with the Dark Lord's principles. However, when my parents said that I had to become a Death Eater or else I'd be killed, I followed their wishes; unlike Sirius, the brave Gryffindor who would have refused to join the Dark Lord even at the cost of his own life. I soon realised that what I was doing wasn't right and therefore betrayed the Dark Lord… at the cost of my own life. I had shown Gryffindor bravery – and, maybe, stupidity – in the last moments of my life; it had taken me until the last moments of my life to finally betray my parents and develop a mind of my own. Alas it came too late.
You see, Slytherins are supposed to be ambitious and cunning, and I was not at all like that, no matter what the Sorting Hat said. No, no matter what the Hat decided all those years ago, no matter that it said Slytherin was the only House that fit me, I believed, and still do believe that Slytherin is not my true House. No, no matter what others would say, I know the truth, and the truth is that Slytherin is everything I am not.