I am in doubt about to learning the English language.

I am From Brazil and my native language is Portuguese. I am currently a researcher and have studied in the best schools and universities on in Brazil and. I think that I speak and write Portuguese very well.
I have speaked spoken with many people around the world who are English native speakers native to the English language and therefore fluent in English. 

I think that English is an easy language to learn. It´s easier than Portuguese.
Nowadays I have a doubt concern to  about speaking English. Do you think that I can feell [only one l] confident in learning English with anyone native speakers?  Can every native can speak and write a correctly in English?
Why am I in doubt? Meanly Mainly because, in my country the education is so weak and not very good. There are a lot of people who don´t speak and or write well in the portuguese.  it´s a quite the opposite Their speak speech is so bad and they write worse than they speak. I think just a good teacher can help a person to learn the correct Portuguese in my country or a person who is very smart and have has studying studied a lot.
I would like to know if that the situation that is happening in my country is only because we are a poor country or because our language is very difficult to learn. It is Is it a reality in every place?

I am not completely sure what you were trying to say in that last line but I think that maybe you were trying to ask, 'Is this a problem in every country?'

I am in have doubts about to learning new languages.

I am From Brazil and my native language is portuguese. Currently I am a researcher and I have studied in the best schools and universities on in Brazil. and I think that I speak and write portuguese very well .
I have speaoken with many people around the world who are English native speakers and are fluent in English .

I think that English is an easy language to learn. It´s easier than portuguese.
Nowadays I have a doubts concerning to speaking English. Do you think that I can fell feel confident in and learn English with anyone native? Can eEvery native can speak and write a correct English?
Why am I in doubt? Meainly because in my country the education is so weak and not good. There are a lot of people who don´t speak and write well the in portuguese;, it´s a quite the opposite, they speak so badly and write worse than they speak. I think just having a teacher can help a person to learn the correct portuguese, in my country or a person who is very smart and have they studying a lot.
I would like to know if that situation is happening in my country only because we are a poor country or because our language is very difficult to learn. It is a reality in every place ?

You are not alone. I live in Washington DC and I am a native English speaker. There are many people who are native English speakers who do not speak or write correctly. It is really amazing. Sometimes it is because of education. Sometimes it is because the place where someone grew up has a dialect that is not proper English. It is something that I believe happens everywhere in the world and probably in every language. Don't doubt yourself. You are doing great! You have more courage that you know and you will be confident and fluent very soon!

I am in doubt about to learn language

I am From Brazil and my native language is portuguese. Currently I am researcher and have studied in the best schools and universities on Brazil and I think that I speak and write portuguese very well .
I have spoken with many people around the world who are English native speakers and fluent in English .

I think that English is an easy language to learn. It's easier than portuguese.
Nowadays I have a doubt/concern to speak English. Do you think that I can feel confident while learning English with anyone native? Can every native can speak and write correct English?
Why am I in doubt? Mainly because in my country the education is so weak and not good. There are a lot of people who don't speak and write portuguese well, it's quite the opposite, they speak so bad and write worse than they speak. I think just a teacher can help a person to learn the correct portuguese in my country or a person who is very smart and have been studying a lot.
I would like to know if the situation is happening in my country only because we are a poor country or because our language is very difficult to learn. It is a reality in every place ?