Learning languages is really a tough journey, especially when there is not a language environmenyou are not surrounded by it. Learning languages is really a tough journey, especially when you are not surrounded by it.

or "especially when you are not immersed in it."

Learning a languages is really a tough journey, especially when there is not a languageit does not {surround you|exist in your environment}. Learning a language is really a tough journey, especially when it does not {surround you|exist in your environment}.

For me, I learn English from some apps on my phone by myself, because no one around me speaks English. For me, I learn English from some apps on my phone by myself because no one around me speaks English.

For mIn my case, I am learning English from some apps on my phone by myself, n. No one around me speaks English. In my case, I am learning English from some apps on my phone by myself. No one around me speaks English.

In English, sentences that are able to stand on their own need to be either separated or joined with a semicolon, not a comma.

Even if you cannotI rarely even see a foreigner in my city. I rarely even see a foreigner in my city.

or "You'd" but I think "I" is better here

Even if you cannot see a foreigner in my cityIn my city, no foreigners can be seen anywhere. In my city, no foreigners can be seen anywhere.

I have thought of many short cuts to learn English, but therey are no useless. I have thought of many shortcuts to learn English, but they are useless.

I think that's what you are trying to say here but let me know if it's not

I have thought of many short cuts to learn English, but there are no usewithout success. I have thought of many shortcuts to learn English, but without success.

I used to study English by listening, because I thinkought that kids learn how to speak by listening first, then can speaking. I used to study English by listening, because I thought that kids learn how to speak by listening first, then speaking.

I used to study English by listening, because I think that kids learn how to speak by listening first, then can speak. I used to study English by listening, because I think that kids learn how to speak by listening first.

But it iwas tough work and seemsed useless. But it was tough work and seemed useless.

Changed to past tense because you "used to" practice by listening

But it is tough work and seems useldoes not seem to lead to success. But it is tough work and does not seem to lead to success.

BI hope that going back and forth like this, I hope it can work effectively for me. I hope that going back and forth like this can work effectively for me.

This is a more natural way to write the sentence

BI hope that going back and forth like this, I hope it can work effectively for me. I hope that going back and forth like this can work effectively for me.