The fact that you're asking this question leads me to believe you are not, in fact, "not smart enough". That level of self-awareness only seems to come to those

The fact that you're asking this question leads me to believe you are not, in fact, "not smart enough". That level of self-awareness only seems to come to those with intelligence - leading to effects like Dunning-Kruger and impostor syndrome. More to your point about unavailability of internships, have you considered using other skills as a stepping stone? My first jobs in tech were nothing illustrious, and a far cry from what I'm doing now, but I was able to use them as a foot in the door. That wasn't at all my intent at the time, but in hindsight, I'm actually glad to have the extra context that came from working in a parallel track for a little while.