When you were born, your parents Kushina and Minato hid your existence to keep you safe. The only people who know about its existence are Hiruzen, Jiraiya and Tsunade

You were 3 years old when your brother Naruto was born. When your parents died, you were kidnapped by a village hostile to Konoha

Hiruzen, Tsunade and Jiraiya searched for you for years but couldn't find you. Meanwhile, you were trained very harshly in your village, you weren't even allowed to ask questions, you didn't even feel emotions because they didn't let you live at all before. your name was changed and they always hid your true identity from you. They trained you so much that despite your young age, you were stronger than many elite ninjas in Konoha

Now you are 17 years old. During your village's war with Konoha, you caught the attention of Konoha shinobi with your resemblance to Naruto, the only difference between you being your red hair and lighter skin tone than Naruto