It is aswhat it is

Today's day was really hard for me.

In Poland we have to wait three months to start a new job that our country gives us -, which is only internship.

I added only here, but I’m not sure if that is what you are looking for.

So I'm broke, and I have no job.

Summer holidaysbreak without money sucks.

I changed this to the more American sounding Summer break, because this sentence sounds awkward to me. I’m not sure if how you wrote it is actually incorrect, or if it’s just British English.

There was another commenter that said to make “suck” without the extra “s” to match “holidays.” I think that “Summer holidays” might be a collective noun in British/Australian English, so “sucks” might be correct? I’m not really sure on that, though.

I live with my mom, and I havwe argumentse with each other almost everyday.

I cut off my friends because I feel aslike a burden forto them, and I don't really know what to do.

No friends, no boyfriend, not even noa cat.

It is aswhat it is

Today's day was really hard for me.

Last month, I finished medical school.

In Poland, we have to wait three months to start a new job that our country gives us -, which is an internship.

Summer holidays without money sucks.

"Sucks" needs to agree with the plurality of the noun "holidays."

I live with my mom, and I havwe arguments with here almost everyday.

Needs a comma to connect independent clauses connected by "and."

I cut off my friends because I feel aslike a burden forto them, and I don't really know what to do.

No friends, no boyfriend, not even noa cat.