I stressed myself out for the interview but didn’t even get the job.

I stressed myself out for the interview but didn’t even get the job. Now I’m left wondering if I didn’t get the job because they noticed my stutter (I stuttered a fair bit in the interview) or because I just suck in general. Either way, it makes me feel like a useless piece of shit. Sometimes I wish I could just work from home and not have to talk to anybody ever again.