Why is it so hard to understand?

Ok, you read well, write and even speak but when you listen to any English speaking country native person talking, it´s like the person is saying only one word and you can´t identify where it starts or finishes.Why does it happen? The answer is connected speach.Just like us, the native people tend to link the sounds. They join the word as if it was only one sound.For example, in portuguese, in instead of saying: "você é quem sabe", we say: "cê que sabe". In English we join sounds just like in: "round shape", the pronunciation is "rounshape",the last consonant isn´t pronounced.Vowels are linked with consonants, creating another sound like: "As if..." we say: "azif".Start training your ears for that!