That was an interesting story with a nice ending. It was a good twist at the end, worthy of any TV thriller.

You need to work a little on proof-reading your text. The hero's name is Nick or Nicky? You used both at the beginning.

Then this paragraph could do with being a lot clearer.

• "About two years ago his neighbor had decided to live on the sidewalk in front, Nicky was nine years old at the time, when he saw him for the first time, he felt a bad vibration in Theo, his neighbor in his twenty years old."

Then this paragraph could be improved:

• "Nick was a little exaggerated to be eleven years old. His mother called him paranoia, he considered it a precaution with a high dose of compromise with humanity."

I got a little lost in some other places too, for example

• "and had to defend her from strange, evil neighbors."

You had not introduced who "her" is yet. later I see it is his mother, but it's not clear at that point.

I think you would have corrected many little things or made them clearer, with a bit of proof reading.

Good luck with your future writing. Your imagination is good.