At this point in my life, I think everyone needs someone with whom he/she can share everythings.

They will force you to be social whileen you prefer to staybe alone.

They don't understand the complexity of today's life and can't give that emotional support.

Your sentence is perfectly fine, but here is a more clear way to say it:

They don't understand the complexities of modern life and can't provide the appropriate emotional support.

No matter how much oneyou achieves, nothing is enough for them.

They look out for our health and well-being, but sometimes they forget about our mental health.

At this point in my life, I think everyone needs someone with whom he/sthey can share everything.

For brevity, you can use the singular genderless pronoun "they".

They will force you to be social whilen you prefer to stay alone.

But they are always presentthere for you whenever you are in danger.

They look out for our health and well-being, but sometimes they forget about our mental health.

"look out for" is a collocation. Also, the second "they" may be omitted, since it's already been used in the first clause.

Our parents are not from our generation, and most of them are not as educated as we are.

Because of the relative pronoun my gut instinct is to not use a comma here

They will force you to be social whilen you prefer to stay alone.

At this point in my life, I think everyone needs someone with whom he/sho they can share everything with.

"They" is used much more commonly that "he/she" when referring to someone whose gender you don't know. Also, the word "whom" is very rarely used by native English speakers, so I replaced it with "who" and rearranged the sentence to make sense grammatically. Your original sentence was grammatical, but this sounds more casual and fluent.

OSince our parents are not from our generation, and most of them are not as educated as we are.,

You should connect your opinion and reasoning into the same sentence if possible. I also added the word "since" because it helps your reader understand that you're giving reasoning.

Tthey don't understand the complexity of today's life and can't give that emotional support.

Connect this to the previous sentence with a comma.

No matter how much oneyou achieves, nothing is enough for them.

Your original sentence was grammatical, but its much more common to hear people say "you" instead of "one."

They will force you to be social whilen you prefer to stay alone.

Theyand won't try to understand the emotional turmoil you are going through.

But they are always presentthere for you whenever you are in danger.

I replaced "present" because it just means that they are physically nearby, but "there for you" carries the meaning that they care for you and support you.

They look for your health and well-being, butthough they sometimes they forget about your mental health.

Since you used "you" in the previous sentence, you should continue using it here. Also, I replaced "but" with "though" because "though" is softer and makes the thing you're saying seem less bad. Since you're listing positive things about parents in this section, it's a good idea to soften that negative thing.