When I make my own characters I can live inside their minds, I know what they're saying, the way they say it, and the body movements, etc.

But with someone else's character it's hard for me. I don't know why. I'm so worried about how I'm going to sound, if I sound like the character, if I move like him, if I am them. With my own it's like, "Yep, I'm acting just as I've pictured them".

Any advice? Should I maybe start building up the characters like I do my own, make them my own? And how would I do that? Should I find a character I like?

No, i think that once you learn how to play the Pink Panther theme, you'll realize how much fun and beauty comes out of having the talent and ability to play such a beautiful instrument, and i personally think it'll make you want to continue on and become a better musician.
That's what happened to me with the violin, and now I'm a professional violinist :) Doesn't get better than string instruments!

In January I'm planning on auditioning for my city's production of the Sound of Music. I'm 14 years old and tall. There is a thirteen year old von trapp girl, which i'm too tall for, and the oldest, who is 16 and I might be too young for. I would love your opinion.

(I would be fine with just a chorus role, but it would be fun to have solos)

Im looking to become a youtuber and im not too sure how to do it does anyone have any advice?

Ive always enjoyed watching funny youtube videos, Music parodies people make, and even lets plays. I always want to become a youtuber and entertain people like all of the greats. ex: BajanCanadian,Pewdiepie. Does anyone have any advice to become one of the greats myself?