Her Damaged Soul

"Screaming and crying and gasping for air. Trapped" I write in my dream journal expanding on the whole ordeal I had experienced not even five minutes ago. I check my heart rate for the second time, 117 bpm give or take, lowered considerably since I'd woken up from that... dream?"
Sapphire Brookingham is 17 years old with straight D grades and a whole lot of baggage which, of course, she doesn't think to share. Now we all know what happens when we keep things bottled up under tight pressure, right? That's right, we burst.
And I wonder who's gonna be straight in the line of fire when little old Saphire does burst... Let's just pray he brought a bulletproof vest.
Warning: profanities may not be used sparingly

So this is my first time writing a book. And it's weird being on the other side of things since usually I'm just the reader. Any constructive criticism would be much appreciated, I can only get better... right?! I'm no good with descriptions so sorry if it sounds crap but just give it a chance