you wanted to meet Zoro! So you sailed the seas and there were a few main reasons why? Because you wanted to best him in a sword match, and you wanted to meet him, and the main thing was you were his sister/brother and you haven't seen him since you were 6

Luffy:"There was this chicken, and it talked to me!"

Zoro:"Luffy, shut up, would ya!

Luffy:"But I just am trying to tell a story*

Nami:"Luffy you idiot chickens can't talk!"

Sanji:"Nami my love you are so smart when you yell at Luffy!"