Why does it hurt to be rejected for a job

So I’ve applied to 7 places and 2 have turned me down after the assessment because either I wasn’t what they were looking for or too many people applied. Funny thing is, those weren’t even places/jobs I wanted to do. I know it’s most likely just the rejection feeling that hurts more but Idk I do kinda worry that all will turn me down. I’m going for call center jobs only as face to face customer service makes me anxious. Please send encouragement cause this would be my first job since leaving my toxic ex and have so many plans for my future but just gotta get the job