Below, you'll see any text that was highlighted with comments from the reviewer.
"The age where everything is both ending and beginning"
I like the words you chose to use when explaining what is most important at the age of 17.
I don't like the ending sentence, it explains too much of what you are trying to convey. I would leave it to make the reader think about what you mean, rather than just giving the meaning of the piece to them.
Other than that, it is really well written and I really enjoyed it!