Bored day

Today I realize that I'm wasting my time. 
I want to leave, but I can not drop everything, I want to give up, but I'm glad that my mom supports me. She is my friend. But I do not enjoy living in Russia
I don't know that to do.

Boreding day

Today I understandrealised that I'm wasting my time. 
I want to leave. bBut I cannot drop everything,. I want to give up. but I'm glad that my mom supports me, sshe is my friend. butHowever, I do not enjoy living in Russia.
I don't know twhat to do.

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Really good job!!! You've got the basics down.

Boring should be changed to "boring". "Bored" describes how others feel. Boring describes how you feel, or things/activites. An example of this would be "This movie is so boring, are you bored?"  

There are three ways to write the first sentence. "Today, I realised that I've been wasting my time." Or "Today, I finally understood that I've been wasting my time." They both say the same thing, but the first one is a bit sadder, and probably more effective. As you're talking about the past "I am" changes to "I have/I've"

The rest is really good! Just remember to capitalise the start of sentences.

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This could be a bit advanced, but will help you in the future and others. You can control the emotions of the reader by varying sentence lengths. For example:

I want to leave. I want to give up. I can't drop everything, I just can't. I hate living in Russia.  I'm glad that my mom supports me, she's my friend. 

Or:

I want to leave but I cannot drop everything and leave, I feel like giving up. I'm glad that my mom supports me, she's my friend. I hate living in Russia.

It's not the best example. However, hopefully the first example will make you sadder, and the second example will make you tired after reading it.