Background check advice: internship termination due to underperformance

In a bad situation now and don't know what to do, feel like it's ruined everything.

I took an internship to earn some extra money in the Finance function of a large company. The hours ended up being IB-level because the team was small and the pressure was high (let's say it was similar to Tesla).

I was essentially being paid min wage (let's say paid $1k per month for IB hours), I got burnt out and started to push back on certain tasks (i.e. sticking to daily tasks/requests, no extra mile work).

Lo behold, a week later, get roped into a meeting with HR and told I am being fired for underperformance.

Now because it was only an internship, how bad does it look if I am honest about the firing/termination? Will HR at BBs/EBs just pull the offer? It's an odd company so it was difficult to have any paper trail and I was not aware something like this may happen so I never collected information on the side.

 I know some firms ask from the start if you've been fired or terminated before, and even if you have, performance related probably looks the worst as opposed to laid off.

I tried to talk to my manager but she wouldn't listen (i.e. what if I resign now). Also, FYI, I had no performance reviews previously - so no warning signs (formal warnings or PIP) that something bad might happen and I should quit.