**blue = idiomatic correction / my addition

highlight = straightforward grammar/spelling thing

strikethrough = get rid of it! 

unemployed

Today I am bored and frustrated because I still haven't got [found] a job: I mean I am unemployed. This situation is stressing stressful for me. There are vacancies, and I send my CV, but I don't [maybe use 'never' instead] get a positive answer.

[** the ":" that I added (the colon), is sooo complicated even for English speakers.  You can also just put a period in]

I sometimes imagine that I get have a job at big company and make a living there. [Right now, / Currently,] I don't have any money.

[**note: make a living, not make aliving!]

My friend Patricia said to me [told me that], if I send her my CV she can help me on join your company.  So I sent my CV [in], and I have hope about it. I am getting a job I am hopeful that I can get the job.

In my opinion, it is more interesting get a job at big company than small company. I've worked at small companies, and now I want to work at big company.

[This sentence is a little awkward:  I would say something like: "I am interested in working at a big company because I have worked at small companies before, and I am curious what it is like to work at a big company."] 

While [In the meantime] I am concentrating in learn on learning English. I am going to learn this language, and maybe it will help me to get [find] a job.

unemployed

Today I am bored and frustrated because I didn't have any job, I mean I am unemployed. This is a stressful situation for me. whenever there is a vacancy, I apply for it but haven't  got any positive reply.
I imagine sometimes to get a job at a big company and make money for my living. I don't have any money on me.
My friend Patricia asked me to send her my CV so that she can help me in her company. Then I sent her my CV and I hoped to get selected this time. I got that job.
In have more interest in get a job at a big company rather than a small company. I've worked at small companies, but now I want to work at a big company.
While I am concentrating on learning English, I will going to learn this language, maybe it will help me in getting a job.

unemployed

Today I am bored and frustrated because I still haven't got a job, I mean I am unemployed. This situation is stresing me out. There are vacancies to which I send my CV but I don't get a positive answer.
I sometimes imagine getting a job at a big company and making a living. I don't have any money.
My friend Patricia said to me that if I send her my CV, she could help me get a job at her company, so then I sent my CV and I now have hope. I am getting a job.
In my opinion it is more interesting to get a job at big company than a small one. I've worked at small companies before and now I want to work at a big company.
Now I am concentrating on learning English. I am going to learn this language because maybe it will help me get a job.