Why is the word "не" used in the phrase: "мне не нравится"= "I Don't Like"
But on the contrary "нет" is used in this one: "у меня нет"= "I Don't Have"
Is it a rule that Always "мне" goes with "не" and "меня" with "нет", I don't find any reasons for the distinction since in English both sentences would include the "I do not" fragment.