I'm actually stressingstressed out about writing orand speaking English because I'm terrified of making mistakes.

I combined the sentence fragment below with this sentence.

Because I'm scared of making mistakes.

You know how pPeople judge us for our mistakes.

Some people so rude for thican be extremely rude when pointing out our mistakes.

Anyway, thiswriting on here will be a start to passing point to overcome my fear.

I rewrote this sentence to sound more natural.

I just want to improve my eEnglish.

I'm actually stressing about writing or speaking in English.

This sounds like how we speak but it can too informal for written English. However, I understood what you wrote.

BThat is because I'm scared of making mistakes.

In written English we don’t start a sentence with because.

Some people can be so rude for this.

I just don't know how can I prevent it.

How to prevent what? The stress? If so, change it to be more clear by saying ‘ I just don't know how I can prevent worrying (another word for stressing) about it.’

Anyway, this will be a start to passovercome my fear.

Pass is not the right word in this phrase.

I just want to improve my eEnglish.

I'm actually stressing about writing or speaking English.

There is nothing wrong with this sentence, but I wanted to mention this just in case. "Actually" is often confused with "currently" for non-native English speakers.

Actually = often comes before stating something unexpected
Currently = right now, in this moment

"People say that liver and onions is disgusting to eat. Actually, I quite like it."
"Currently, I'm eating liver and onions."

Bbecause I'm scared of making mistakes.

This connects logically with the previous sentence, better to combine them

Some people are so rude for this.

Anyway, this will be a new start to surpass/overcome my fear.

I just want to improve my eEnglish.

English is always capitalized (and this is the case for all nationalities/languages).