This job can be so demoralizing...advice?

I (22) work as an Executive Assistant to a few senior leaders. This includes doing the usual things, such as sending emails, calendar invites, booking conference rooms, notes, reorganization, etc. This regularly also includes working through lunch or after hours.

For every 1000 things I do, I make one mistake - it happens...Nothing client-facing, stuff that was an honest mistake, like putting a document in the wrong folder or adjusting a calendar invite subject name...when asked, however, I always adjust within 10 minutes of being told, regardless of the day or time.

Nonetheless, a mistake is a mistake...I understand that...but, I'm really trying. I will spend 30 minutes reviewing a 2 sentence email, sending calendar invites, reorganizing daily, etc. No one really cares about what I do right. It just feels so demoralizing. They call me careless or even stupid.

This is my first job, and any advice would be appreciated. They make me feel so stupid and unhelpful, because I know the jobs aren't hard per se, but it is a lot of tedious tasks. Also, if someone else messes up, it also becomes my mistake, as I'm the messenger for most information. There aren't ways for me to fact check either, because I don't always have the context.

Am I being a baby? I know I'm being a bit overdramatic, but it sucks having to eat lunch at 5PM and then getting called out for being "careless." :(

edit: thank you everyone for the sweet comments and advice 🥹🫶 i'm not going to let them get to me, and also explore other options! in the mean time, i will hold my ground - i deserve a lunch break!!! thank you all for the love and support <3