Re: must or have to
We look to teachers of English to give a good example in this forum. Please always begin every sentence with a capital letter, and capitalise the personal pronoun, I, princess 62.
Some native speakers use 'must' for an obligation imposed by the speaker, 'have to' for one imposed externally.
Teacher to student: You must do this homework tonight.
Student to mother: I have to do this homework tonight.
Please do not edit your question after it has received a response. Such editing can make the response hard for others to understand.