I'm going to do a version of it that's revised by yours truly, 'cuz I'm a grammar nerd. Sooo, the places where I edited will be in bold.
I've got one word for you: vampires. My life has revolved around them since the day I was born. Honestly I'm not sure why, but they have always fascinated me, whether it be good or bad. I think the real story of my life starts in about sixth or seventh grade, thought. 'Cause I sure as hell ain't going into all the sh** from when I was a little kid.
Like I said, the story starts now, my version.
So, that just how I imagine an edited version of it would be. You need a bit better punctuation, and you have a few capitalization errors here and there. You also need a bit of work on choppy or stringy sentences. Those can really mess a reader up. There are very few spelling errors. Also, it's not very good writing to start a sentence with 'but.' There are some exceptions, like when it is unavoidable, but other than that, it's best to try not to. If you need better editing than what I can do, I recommended Microsoft Word.