Why am i so different then anyone else in this world why can't people just see things the way i do ?

Not to sound cocky but im smarter then anyone i know although my grades don't prove it. I'm really different and i feel like i dont belong in this world. i isolate myself from people because of the way i am. it seems like everyone around me is fake and they dont control themselves. Maybe i just have more control over my brain and body then the average human. im constantly being told by teachers that i have such an high IQ but i never took one of those tests. My life is awkward i have visions of the future events and they come true i can also predict outcomes of events and im always right i dont know why am i specially talented? Everyone says my mind is dark and demented because of the things i say. I have serious anger and anxiety problems i get mad easily and in my head i come up with insane thoughts and i can honestly say im afraid of being left alone with my mind , its dangerous .. Can anyone help me out with finding out whats wrong with me ? where could i take a test that shows my brain activity ? i also feel like i was put in this world for a purpose but i still havent found out what it is yet .. i have a great feeling i have a big role to take in 2012 though ..