I would go meet my younger self to correct some mistakes
For once in your life, try something new and exciting.
The subject of the above sewntence is A. an understood you.
The sentence talks about you and the speaker is talking to you.
The above sentence is a compound sentence. It has an independent clause and a dependent clause.
The independent clause is (You) try something new and exciting.
The dependent clause is For once in you life. It starts with a coordination conjunction and it cannot stand on its own.
Romeo’s character as he persuades Juliet to kiss him.
Romeo is trying to get Juliet to kiss him and she initially refuses. Her refusal to kiss Romeo develops her innocence, but the witty banter she uses with Romeo also develops her as clever and intelligent. She is not shy with Romeo and she isn't describing her religion. She uses religion to deny Romeo his kiss, but he turns it around.