Then I received a formletter from another company to inform me that I failed in their interview.

I fellt terrible.

I cried,. I don’t know what I am I gonna do.

Or:
I cried "I don't know what I am gonna do!"

I fellt stressed.

I am thinking of ways to get out of my house but I don’t have enough money.

Get out of your house... to distract yourself from your hard situation? Because then the expression is "out of the house"

Today ishas been a bad day, I hearreceived bad news from my company.

You can also say "Today is a bad day," but it might sound a little odd since it uses present tense.

Then I received a form from another company that I failed in the interview.

Finally, my father yelled at me because I forgeot to bring his stuff to my house.

I felel terrible.

I cried, I don’t know what I am I gonnagoing to do.

You can also say "gonna do" but that is more slang than formal speech.

I felel stressed.

I am thinking about ways to leave my house, but I don’t have enough money.¶
I am trying to get out of my house, but I don’'t have enough money.

Today iwas a bad day, because I heard badawful news from my company.

You're talking about today overall, therefore it should be 'Was' not 'is.
'Today was a bad day' and 'I heard bad news from my company' are two independent clauses. They should either be two separate sentences, or they should be one, with a connective (Not a comma) such as a semicolon, or the word 'because'.
Better not to say 'bad' twice; use a synonym, such as 'awful' or 'terrible.

Then I received a form from another company that I had failed in the interview.

I felel terrible.

'Fell' is the past tense of 'fall' as in 'I fell down the stairs'.

I cried,; I don’t know what am I gonna do.

Like I said above, two independent clauses that should be joined together by a connective or separated into two sentences. Here, it could be a semicolon so that the sentences aren't too short.

I felel stressed.

I am thinking to get out ofof leaving my house, but I don’t have enough money.

Comma after 'but'.
'To get out of your house' is basically leaving, so you can say that instead.
Also, it's 'I'm thinking of', not 'I'm thinking to'.

Today iwas a bad day,: I heard bad news from my company.

I will be firedlet go in a month.

"Fired" describes the action itself, of deciding to end someone's employment for reasons related to their performance. So here, it would be more accurate to say something like, "They fired me with one month's notice." "Let go" can be used more loosely to refer to when you actually leave.

Note also that there is a difference between "let go," "fired," and "laid off." The beginning of the response here explains it: https://www.askamanager.org/2008/12/resigned-or-let-go.html

Then I received a formletter from another company telling me that I failed in their interview.

I cried,. I don’t know what I am I gonnagoing to do.

When expressing implicit questions in a declarative sentence, inversion is not used.

I fellt stressed.

I am thinking to getabout getting out of my house but I don’t have enough money.

"Getting out of my house" doesn't make sense here, since "your house" is generally always where you live. Do you perhaps mean, "getting out of my parents' house"?

You could also say, "I'm thinking of changing my living situation."

Today is a bad day, because I heard bad news from my company.

This sentence has to have a transition word because there are two different clauses (ideas). I put "because", but "since" would also work :)

Then, I received a form from another company that I failed in their interview.

"their interview" sounds smoother than "in the interview"
Also, I put a comma after "Then" because it is being used as a transition word in the beginning of the sentence. Any transition words at the beginning of the sentence need a comma (with a few exceptions - but most need it)

I felel terrible.

I cried,; I don’t know what I am I gonnagoing to do.

So, these are two separate sentences. On its own, each sentence has its own meaning and they are fully functional. When you want to combine two sentences, you use ";" instead of ","

I felel stressed.

I am thinking to getabout getting out of my house, but I don’t have enough money.

Today iwas a bad day,. I heard bad news from my company.

To make this one sentence, write something like "Today was a bad day, because I heard bad news from my company."

Finally, my father yelled at me because I forget to bring his stuff to my houshome.

This clarifies the sentence and sounds more natural, unless you and your father were living in separate homes.

I fellt terrible.

I assume this was a typo.

I cried,. I don’t know what am I gonnaing to do.

"gonna" is very informal, and would only be appropriate in something like a casual email.

I fellt stressed.

I am thinking tof getting out of my house, but I don’t have enough money.