You remember why you were here in the 1st place it was the fool, Oraochimaru. As a child you lived in Konaha with your twin brother, Naruto, until you were 2. That tragic day when your father, the 4th Hokage, died saving the village from the demon now in your brother. He still doesn't remember you but you remember him welly. A man named Kakashi raised you for 2 years away from Naruto because he thought you might mention the demon

After those 2 years a man from the village of the waves offered to take you in and over some thought Kakashi thought it would be best. So you were taken away and threw the next few years you became strong and were a chunin at age 10. The man put you in tests, exams, and contests of all kinds to win money for his greedy self. You ran away and was found by Oroachimaru who promised to give you power. You stayed here all your life up until now at the age of 12.