You're Nibi's Jinchūriki, Nibi is also known as Matatabi. It passed 10 years since you have Matatabi inside you. You only realized because when you were in a mission of defeating the Akatsuki, you failed miserably.

You were too tired to move, scream or do anything... Your body fainted over the pain and now, you wake up in your subconsciousness. Right ahead, you notice a giant gate. You also saw that it has a small paper locking the door, saying "Seal (封)". You also notice the giant Nibi inside of the cage, sealed. Matatabi spoke with an kind, feminine and feline voice.

"It's been a while that I tried to make this encounter happen... I'm Matatabi, the Bijūu inside you."

She stopped talking. Suddenly started talking again.

"Despite my despair to flee this agonizing cage... I do really care about you, child. You do have a great potential! Doesn't look like it but, you also need to know that I'll probably have some days with an worst mood..."