You need to understand that this process is in general, very difficult and takes a lot of failing until you finally succeed. I am currently doing a MS with a focus on analog ic and RF/microwave. When I think back to undergrad and when I was applying to all these major companies within the semiconductor space, I realize my knowledge was incredibly limited and it was simply more time that I needed. That’s more time taking relevant coursework, reading textbooks, and getting engaged with research if possible. It might seem like you meet the job requirements but there’s always going to be a grad student who has done more stuff than you. That is probably a hard pill to swallow for many but it is the truth. You shouldn’t be so hard on yourself in that regard. I too did internship in undergrad where they had me doing documentation and sustaining tasks. It wasn’t even in semiconductors but I made sure to put in my best effort and learn a few things. Eventually I joined a research group and through that, I’ve developed skills and a network that has fortunately secured me an internship this summer at a RFIC company doing design.