It only takes a day for a company to lay you off.
The interview process my major companies are often designed to convince you of prestige and the illusion that they are coveted, but if you really look at how things work in the corporate world, we are individually a product that they buy into as consumers. If they undervalue the product, and the product is something they don't really need for whatever reason, they will try to haggle.
If they need you as a product, and you develop and know your value, you can negotiate better, from a position of strength. Personal growth and confidence is a continual process of building and renovating, but it always has a peak, and even ebb and flows throughout. There is never one clear path to success, but rest comfortably in knowing that all you have to do is survive and grow, carrying only what matters for each role you need to play in life.
Your life isn't linked to a job, it's linked to survival. Never let an employer convince you that you are not worthy of a job, and never let a job be the only value you have...
Work to qualify for interviews at companies where you get interviewed by execs, not by middle and lower management. The friends you make in those roles carry weight. A big part of success is the "Grey Hair" rule. Accept that when you are young and less experienced, things will be harder. It gets easier to navigate as you grow grey hairs and more experience if you work efficiently and effectively (not furiously). Resume formatting and a cover letter aren't really what get you the job. Your experience, personal product, and presentation does... Don't overthink the process... Overthink your personal life goals (What you want to accomplish in your personal life, not in work for an employer).
I am not usually a positive person, I am a practical one. The world is a lot less intimidating and more easily understandable when you focus on what you can control... Work to live, don't live to work.