Depending on where you attend school and if English is your native language it is important because if you go to an school whose primary language is English people can understand you. If is your second language it also gives you practice with the language. There is nothing wrong with using your native language (L1), but when learning a new language (L2) it helps to practice it. At first it can seem strange because you use your L1 to think of the words in L2, but with time and practice soon you won't have to do that. So, that is why it is important to use your L2.
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It is not.
English is a very useful language and is the preferred or even the compulsory one in many occupations.