You have difficulty making new friends, and it is even more difficult for you to maintain the ones you have made. You are used to finding criticism and harsh words when you express who you are, and so you have learned to hide it and perhaps even despise it. Many have thought of you as being vain, conceited, cold and distant, simply because you have a hard time trusting anyone except yourself. You let nothing stand in your way of acheiving a goal, and your relationships will sometimes suffer for it. Perhaps the most feared of the houses of Hogwarts, within the walls of your common room, you will find witches and wizards of similar mindset and capabilities. Congratulations - you belong in Slytherin house.