How do you keep going after 18 rejections? after 18 years as a security officer

I sent 18 applications and heard nothing back, and I am running low on energy. It has been weighing on me all week. I keep comparing myself with friends who are working. What helps you on bad days?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.