Am i a good writer? please tell me?

Good writing, bad grammar. Ignoring the grammar issues, it's a pretty good piece of writing. Gets the emotions across well, good description. Excellent for a 15 year old! But you really, really need to work on the grammar. If people have a hard time reading it because of that, they won't give it a chance long enough to see that it's actually pretty good. Don't give up, keep writing. :)