The sSuperheroes are very interesting to me.

In English, you don't use "the" usually when making a general statement about a group (e.g: "Ribbons look cute on me", "Superheroes are very interesting", etc)

Firsty, they have something special whatich we, common people, don't have, and secondly, we can always realy on them, because they are here to help us.

I always wanted to be a superhero and until, but only recently I'vehave I been only thinking and writing about it.

One night I wrote in my diary what kind of hero I want to be and also what powers I have.I'mwould have. I would wearing tight black suit with sparckles on it and, with a black mask on my face because my favourite superhero is Batman. I have a long brown hair tied in pony tail.

"would have" since it's a hypothetical/imagined idea.

I'm wearing a would also have cool sneakers. My superpowers arwould be really amazing.

"a cool pair of sneakers" could also work.

I canould talk to animals and plants.

I think they need a superhero as well so they canould teell what they needed. Next, I canould flying.

"could" and "needed" are here in the subjunctive (which usually just looks like the past tense), because you're describing a hypothetical, in this case: "so that they could tell...".

Im'd be invisible too,. I think that I am'd be a really super cool hero. I faell asleaep and I dreamed of meyself as a superhero and when I woke up and looked in the mirror I washad become a superhero...

"I'd be" = "I would be" (It's a contraction)