freaking out!

okay so my uncles taking my old phone to get repaired as it does turn on it’s an Iphone 6s and i’m worried about my camera roll and my search history... rheres the stuff you wouldn’t want other people to see if you get what i mean but my phone doesn’t turn on and i didn’t give a password so surely he’d have to fix the issue of it not turning on then connect it to itunes and reset it to default??? so will he see what’s on my phone cos i’m freaking out so bad