I don't want to be perfect or usinge technical words.

Thank you for reading it.)

Today I was listening to music, and a song reminded me of something I've heard all my life, especially when someone gets close to me or we talk for the first time: "I didn't takhave the courage to speak to you because you look so angry orand serious."

This phrase, at the beginningfirst, made me laugh, but with time it started to make me uncomfortable.

There's some subtlety to this, but "at first" is far more natural for more general, non-specific things. You'd use "at the beginning" if there's a more specific time or place that you are talking about.

"At the beginning of the story, the hero is still in his home village."
"At first, he doesn't care about adventuring. But soon, everything will change."

It isn't because I feel bothered by my serious personality, but I feel that people make conclusions without meeting me.

A more natural alternative: "... but it feels like people make conclusions without meeting me."

They judge me for my facial expression, my silence, or not being so expressive at the starfirst.

It's curious thatbecause, if you ask my best friend or my husband, they will tell you the opposite: "you cannot have a short conversation with her because she never shuts up."

"It's curious that" sounds rather odd here. This might be because we are saying that an "if/then" statement is "curious". Note the following:

"It's curious that you asked him."
"It's curious because, if you asked him, he would tell you the opposite."

I speak a lot, but not with aneveryone.

If you don't speak with anyone, that means you never speak to people, ever.
If you don't speak with everyone, that means you speak to some people, but not all.

If you meant that you talk a lot to yourself, I would use the verb "talk" instead of "speak", because "speak" carries with it the sense that you are speaking TO someone. The phrase "I speak a lot, but not with anyone" feels like it contradicts itself.

When I feel uncomfortable or not understood, it's a big effort to express myself.

Alternatively: "...it takes a lot of effort to express myself." But otherwise, I understand you perfectly.

It's a hard cirycle to breake.

There, my real personality gets out: happy, lovely, emotional and speakertalkative.

"Speaker" can't work as an adjective.

But, if I feel that I need to make an effort to please or fit in, I prefer to keep in silencet.

My goal is to be able to writinge understandable English.

I don't want to be perfect or usinge technical words.

Today I was listening to music, and a song reminded me of something I've heard all my life, especially when someone gets close to me or we talk for the first time: "I didn't take the courage to speak to you because you look so angry or serious."

It isn't because I feel bothered by my serious personality, but I feel that people make conclusions without megetting to know me.

They judge me for my facial expression, my silence, or not being aso expressive at the start.

It's curious, that if you ask my best friend or my husband, they will tell you the opposite: "you cannot have a short conversation with her because she never shuts up."

I speak a lot, but not with aneveryone.

“just anyone” would also make sense here, if that’s what you meant

And when I feel that somebody is judging or labeling me, I close myself off even more.

It's a hard circle to breake.

There, my real personality gets outis shown: happy, lovely, emotional and a speaker.

But, if I feel that I need to make an effort to please or fit in, I prefer to keep instay silencet.