new job oopsies

so i started my new job a week ago and everything seemed fine but yesterday i was working on an important project and instead of emailing the attachment to my boss, i accidentally cc-ed it to like fifty other people including vendors and clients. omg the panic! everyone’s been so nice about it though. just wondering if this is normal for first jobs or am i really that bad at this? also does anyone have any tips on how not to do something like this again? thanks!