Boss asks if I think this is the right job for me?

So a little background. I started my first 'programming job' close to one month ago. A lot of my onboarding so far is just learning with very little work that provides value to the company. So three days ago I choke on a minor but simple mistake, which ended up being an easy 40 second fix. It was a based on networking, which I am just learning. My boss ends up not being pleased. I mentioned to him later that I was just a little stressed (due to personal issues which I didn't disclosed)

Two days later, he pulls me aside. He basically says that with a masters that he figured that some of the nonprogramming concepts would come easier (we are a hardware startup and I do a lot of things nonprogamming related; hardware, PLC, electronics, etc), but my degree was mainly software focused. He was very kind about everything, but then asked "you have to decide if this is the right job for you", and said that this job will require a lot of self-study. I had a moment of honesty with him, close to tears that this point, explaining why some of the hardware is not an instantaneous learn.

Near the end of it, the conversation was just general mentorship stuff, basically saying to not be so nervous, and ended it with "everyone here likes you and wants you to succeed".

How screwed am I? This is my first tech job and I don't know how often these conversations come up, but usually I think that you have to decide if this job is for you is a kiss of death. Or maybe I'm just overreacting and he was trying to engage my commitment to the company?