Correct my composition please.

I was twelve years old enjoying my summer after fifth grade. My two cousins, Blake and Lacy, my aunt's boyfriend, Chris, and his daughter, Emily, and I hopped in Chris's old ford truck. All of us kids had been decided that we wanted to build a tree house. We were headed to town to buy supplies for the tree house. As we were all getting in the truck there was no sit in the front for all of us, so Blake and I jumped in the back bed of the truck, not knowing this would be a choice that would change our lives, and would be remembered forever.
After getting supplies in town we were driving home on the back road It was a midday, but the sky was very dark. Blake and I were laughing so hard bouncing around in the back. We were having a great time until the truck went out of control and began to tip.
The next thing I remember was holding onto the side so hard that I could have bent the metal on the side of the bed. I stick on tight while Blake flew out and hit a tree. Unfortunately because I held on, the truck ended up on top of me, trapped me underneath it. There were some logs, that were luckily lying on the side of the road, that held the truck up just enough so that the truck didn't completely smash me, if they hadn't have been there I would have been crushed and killed.
We were miles from home or from any houses or people who could help us. My cousin Lacy, who had a broken nose and cut up face from smashing into the windshield, took off running for help. Her face was bleeding horribly while she ran three miles before finding a house. Just our luck, the first house she came to, the people that lived there didn't have a phone so they drove Lacy to the next house to call 911.
In the mean time, I tried to survived the pain I felt all over my body. I even can’t moved at all that I tried to screamed for immediate help. I dizzy and didn’t realise right away what would happened at my misfortune life.

2:35 a.m. Even though it was something that I had experienced before, the pain still took me my surprise I soon realised that I was in Hospital. There were a group of doctors, standing a short distance from me and obviously waiting for me to lose consciousness. As I opened my eyes, immediately all the doctors checked for my conditions. All the people in the accident secured except for Blake that had died on the spot.

The car accident will always be a major moment in my life because of what it showed me. That accident gave me visual proof that God has a plan for everyone and everything has a reason or hidden message, it reminded me to cherish every moment has though it was my last, because I don't know when it'll be over. I know its kind of a sad way to view life but I really don't see it that way. I see it has more of a reason to cherish every moment and live life with no regrets