Why do HR people ask stupid questions like the following ones? Everytime I get those questions, I have imaginary answers like the ones right after each question.

Why do you want to work here?

- Obviously, because I need the money to survive. I'm not here because I love working for you and having to endure your stress. I'm not that type of a kinky person.

Are you flexible?

- Why? Do you want to annoy me when I'm sleeping in the middle of the night because of a sudden deadline or because a god damn employee didn't show up?

Do you see yourself as a perfect fit for both developer and tech support roles?

- Read my fucking resume, moron. I applied for a developer role. Nothing else.

Where do you see yourself in 5 years?

- As if you would care. It's none of your business, but since we are at it. I see myself as your manager in 5 years. Hope that you like that thought.

We didn't bother reading your CV. Would you like to tell us about yourself?

- Nope. Have a nice day and suck my dick. I'm leaving.

Can you give us your phone number and the phone number of your girlfriend?

- I didn't know that I am selling my soul to your company by accepting this job offer. I'm not your slave and you will not call me whenever I'm enjoying my private time.

What's motivating you?

- Money and the peaceful vibe at work when you are shutting the fuck up when I'm fully focused during my projects.

How do you handle stress?

- I dick slap everyone infront of me.

Do you see yourself as a hard worker?

- Nah, I'm not interested in sucking dicks, eating her ass and bending over to get a little bit of a raise.

Cannot understand those who are frustrated with it.
Sure, one can feel frustration when some project is not going as they were supposed to go, but that is life for ya, boi.

Without wanting to offend anyone it feels like devs who complain so much either do not actively search for a solution and learn shit properly and cry their soul out afterwards or they do search, but cannot find anything.
Patience is the solution. Do not let yourself fall down and stay strong.
Even if it takes a lot of willpower, retries, inner pain, patience and non-sleepy nights, you will and can do it. I believe in you.

My whole life was basically a psychological disaster.
I have had and still have depression and a lot of short frustrations from time to time, too, but I do not cry it out loud.
My high school is fucked up. In every single aspect. I am doing all-nighters almost every day. With maybe half an hour of sleep to get school projects done on time.
I cannot just say "fuck you. I am not gonna do this shit" to school, because that would affect my grades in a negative way. Same thing applies to you, as an employee, too. But at least you do not need to be afraid of getting bad grades.
Bad grades->not getting the desired degree->bad chance of finding a job
In your case:
Bad communication with boss->bad connection->bad chance of finding a job

But is that really so?
I do not think so. Nonetheless, you still can have a good chance of finding a job, if you have proven yourself to others in a great way. Everyone has bad times. Even with their bosses. That's normal. Being bad with someone does not make yourself bad in general.

The job world will still accept you, but school won't accept you again. Whenever I feel like the burnout is about to catch me, I take an immediate break and go outside. Take a walk in the sunset. Go to the forest. Run with music playing loudly. Swim. And other things like watching the stars in the silence of the night.

To finally come to an end here...
Do not make yourself feel bad that quickly and try to endure the pain. This is going to make you a better and stronger person.
If you cannot do it anymore (hitting the borders of burnout), take your time and do whatever makes you happy and treat yourself.
Life is not all about work. Were you born to be a worker? No. Were you born to be a slave of others? No.
What is holding you then? Let go of all the stress (for a minute). You are free.

You are a great person.
Do not forget that.