I am English Sou Inglês Soh Ingle[a]ysh – only said by males
Sou Inglesa Soh Ingle[a]yza – only said by females
  
I am Portuguese Sou Português Soh Portooge[a]ysh – only said by males
Sou Portuguesa Soh Portooge[a]yza – only said by females
  
I am from England Sou da Inglaterra Soh da Inglaterrrra – lit. “I am from the England”
  
I am from Portugal Sou de Portugal Soh de Portugal – they don’t say ‘from the Portugal’ (like they do with England), just ‘from Portugal’ (like we do).  Most other countries of the world require ‘from the’ (‘do’ or ‘da’ depending on the gender of the country – see section on nouns below)