I think for humanity, seeing theiour future is a very important thing, because if theywe don't see this, they're getting lost thei we lose our self.

"we" as you are also part of humanity

I know what my future willholds.

Some people don't understand this andwhich creates some problems forin their life.

In reality, pressure from humanity is very heavy.

Grammatically correct, but is not clear what is meant. Maybe: "In reality, there is a lot of pressure from others on what to choose."

Person,Somebody who hasn't chosen a profession has to live with this pressure alone, while he or she sees how his or her future turns out.

I think for humanity, seeing theirone's future is a very important thing for people, because if they don't see this, they're getting lost their selflosing themselves.

Every humaperson has to choose a profession.

"human" sounds like you are not a human, like an alien talking about us.

I think for humanity, seeing their future is a very important thing, because if they don't see this, they're gettoing lost their selfto get lost.

I don't know if this is intentional, but referring to humanity as 'they' implies that you are not part of humanity - which presumably you are. Despite this the sentence is grammatically correct.

"I think about humanity, seeing our future is a very important thing, because if we don't see this, we're going to get lost." - this is what you would write if you were part of humanity.

I know what my future will be.

In reality, there is a lot of pressure from humanity is very heavy.

Person,Someone who hasn't chosen a profession has to live with this pressure alone, while he or sthey sees his or their future.

Rather than writing 'he or she' when the gender is unknown, just use 'they' since this is short and easier and means exactly the same.