Correct English grammar can sound really rude
There are some things which are grammatically correct in spoken English, but you really shouldn't say because it sounds rude.
Things like; I want . . . . Give me. . . . You need to. . . .
They all are perfectly correct from a grammar point of view, and even if you were to write it, it would be fine. But in spoken English, these things can sound like you are giving people orders that they must obey on pain of death.
You can get around this problem by changing the phrase into a question. Instead of saying, " I want to meet on Friday" you can say, "Could we meet on Friday?".
Of course, how we say things, is also important. We have all been in a situation where someone is saying to us "Have a good day", but we know what they really mean is, "I hope you get hit by a bus on your way home!". Listen to how natives do it, and try to copy them.