Public speaking is excruciating for highly conscientious people.

As a speaker you're asserting that what you're saying is important enough for the whole audience to give it their undivided attention right now.

When someone is reading your blog post, they can choose to stop and leave at any point without being rude, or to read it at their own pace.

But for public speaking, the audience member is there, and it's rude to leave or look at their phone.

It had better be worth their time!

As a conscientious person that's a massive amount of pressure to not let people down.