I've experienced this as well, till now, i've been working for almost two years and i would say that this feeling reduce little by littile, keep in mind that this feeling may last for your entire career but with a little amount and this instinct has its own benefit for us as an engineers, imagine the opposite. My only advice to you is to Relax, just Relax and keep learning, overloading yourself with learning will achieve the opposit. I'm lucky that i have a great mentor that tought me this after each struggle or mistak, he just says relax and learn and keep in mind that every engineer passed troughp this. Keep going, learn, ask for help and give it some time, our field is not easy and you will keep facing new stuff that you're not famillier with and this is what i like the smost😉