ForTo beginning I will start with introducing!

I’m twenty fourth years old and I work as an administrator.

Just so you know, an 'administrator' in the US is an unusual term. I would assume an administrator is at a school or something. If you mean a manager in a company (HR or something like that) you should say 'I work in management' or 'I'm a manager at a company' or something else like that.

Now I'm just learning more about it and I really love it!

If you mean a habitual 'currently I am learning more about it' I would use the corrections.

I like to study new things and I like to be better everyday.

Because, you know, we always have a struggles in our life andves, but life gives us a lot of useful lessons and we need to be able to understand thisose lessons.

A bit of a run-on, "x and y and z" is not technically correct but commonly seen in casual speech. If you want "school correct", use the corrections.

I also learn to listen, what life wants to say to me at the moment.

For example, I think now I am learning that I shouldn’t always expect something from another people.

It’s amazing, but I can do all this things what I want (attention, kind words, gifts ect) for myself.)

Unnatural phrasing. What's amazing? Amazing can be both positive and negative, but it's unclear how you mean it here

Also today is the last day before vacation, so I’m happy!))

There are a few people at work, so I have no tasks now actually..)) Therefore thanks to this day for its calm condition,and relaxation) ¶
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PS Guys, do you need this text in Russian??

Double period is never used in English like that. Either one or three. 'so I have no tasks now actually.' or 'actually...'

My name is Kristina, and I want to improve my writing and my grammar.

In English, when you have two complete sentences connected by "and" or any other conjunction, you need a comma before "and".

ForTo beginning I will start with introducing! myself.

"For beginning" is just not said in English. The verb "introduce" needs to have a direct object, so I added the word "myself". This is not an exciting or emotional or surprising statement, so an exclamation point (!) is not necessary.

I’m twenty fourth years old, and I work as an administrator.

"Fourth" is an ordinal number, a number that shows in what order things occur, such as a fourth child, the fourth level. "Four" is a cardinal number, a number that tell how many things you have, such as four children, four levels.

I have a degree in psychology, so I want to work in this field in the future!.

Again, exclamation marks are used only for exciting, emotional, or surprising statements. A period or full stop is fine here.

Now I am just learning more about it, and I really love it!

I like to study new things, and I like to be better every day.

"Everyday" means common or ordinary, such as everyday tools. "Every day" means each new day, such as "I go to school every day."

Because,As you know, we always have a struggles in our life, and life gives us a lot of useful lessons, and we need to be able to understand thisese lessons.

When you begin a phrase with "because" it will be subordinate clause, that is a sub-sentence that needs to be attached to a complete, independent sentence. You could have connected it directly to the sentence that comes before it.

I also learn to listen, to what life wants to say me at the moment.

For example, I think now I am learning that I shouldn’t expect something from another people.

"another" refers to one particular item or person, such as another piece of cake. "other" refers to groups of things, such as other kinds of dessert.

It’s amazing, but I can do all thise things wthat I want (attention, kind words, gifts, ectc.) for myself.)

I don't understand what you are trying with the words in parentheses (attention, kind words, gifts, etc). Maybe you should delete these words or explain them with examples.

Also today is the last day before vacation,. I’m happy!))

Two complete sentences should be separated by a period or full stop. This is a good use of the exclamation mark. The parentheses )) are not needed.

There are only a few people at work, so I actually have no tasks now actually..)) Therefore thanks. Therefore I am thankful for this day for´s calm condition, relaxation) ¶
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P.S. Guys, do you need this text in Russian??

Adding "only" to the sentence emphasizes that there are usually more people around and the lack of people is why you have no work.

I’m not sure that it is super interesting for people here, but maybe

Never apologize for practicing English or doing your best. This is good work.

My name is Kristina and I want to improve my writing and my grammar.

For beginning I will start withby introducing myself!

I’m twenty fourth years old and I work as an administrator.

NowIn the meantime, I just learn more about it and I really love it!

I like to study new things and I liketry to be better everyday.

Because, you know, we always have a struggles in our life and life gives us a lot of useful lessons and we need to be able to understand thisese lessons.

I also learned to listen, what life wants to saytell me at the moments.

For example, I think now, I have learnt that I shouldn’t expect something from another people.

It’s amazing, but I can do all thisese things wthat I want (attention, kind words, gifts ectc.) for myself.)

Also, today is the last day before my vacation, I’m happy!))

There are a few people at work, so I have no tasks now actually..)) Therefore, thanks to this day for calm condition, relaxation) ¶
ing and relaxing me. ¶
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PS Guys, do you need this text in Russian??

I’m not sure thatif it is super interesting for people here, but maybe?