I say "simply" because, if we think about "what isdoes it mean to writinge a book is?", we can just answer "put words after words and at the end, it creates a book."

But we know the reality is not as easiery as that.

"easier" is used when comparing to something else. When you don't have a point of comparison, then "easy" is best.

Write a book requirest determination, organization, imagination and a (whole) lot of others things with "ation".

"whole lot of" is a pretty common phrase in casual speech and this comes across as pretty casual

We need to fight against our fears : fear of failure, fear of what others are thinking, fear ofor our legeitimitacy.

"fear for" is used when you're worried that something might not be enough or that something might be in danger

If we realize a dream, it will never be a failure.

"fail" as a noun (rather than a verb) is very casual internet slang. In anything but the most casual internet conversation, it's better to use the standard noun "failure"

People are always have something to say, good or not.

Iit's your life.

semicolons/colons do not automatically add a capital letter after

If you need the approbeciation of others, you never be yourself.

approbation is very formal and a little old-fashioned. It's like... managers discussing how to reward employees at a business conference. And even then they'd probably say appreciation.

You only willwill only be the projection of othemselvers.

Realizeation of a Dream.

Some are easy to realize, while others are more difficult, or impossible.

I say "simply" because, if we think about "what is writing a book is", we can just answerit is simply "putting words after words and at the end, together until it creates a book."

That was a really complex sentence for you to create, but I think I was still able to understand what you were trying to say.

But we know theat reality is not as easiery as that.

"is not as easy as" is a really common phrase in English.

Writeing a book requirest determination, organization, imagination and a lot of others things that end with "ation".

"request" is something that another person asks you to do.
"require" is something that "must be done" in order for something to happen.

We need to fight againstace our fears : fear of failure, fear of what others thinking, fear of our legeitimitacy.

"We need to face our fears" is a really common English phrase, though maybe it's not the best one to use here. A few phrases that I think would make more sense are:
"We need to concur our fears..." (this one is probably the best)
"We need to work through our fears..."

YBut you know, we don't care about all of that.

In proper written English, you should never start a sentence with "but", but in spoken English (which this post seems to emulate) it happens all the time and sounds more correct here.

Also, you want to use "but" because you are contrasting what was said in your previous sentence.

If we realize a dream, it will never be a failure.

People are always have something to say, good or not.

It's not their life :.

If you need the approbationval of others, you'll never be yourself.

You only will be thewill only become a projection of themselves.