Nah. The secret is that interviewing skills are almost orthogonal to real life skills. It doesn't hurt to have the know-how, the chops to do the leetcode problems but it's questionable if you will ever be able to use them in the real life (unless you do really specialized work - and at that point you will need to know way more).

So 1) don't feel bad. it's just like a muscle you don't normally exercise. Start exercising it and you will get better. 2) accept that this is part of our shifty industry - it is what it is. It's pretty dumb but you will have to go through this hazing ritual every time you get a new job.