Welcome to the forum, buddy. Hope you have a good time here.
ast,i have a question,why your country not use your own language, but not english as your writing language,you know we can understand you, but you can't understand ours.
Its kind of a long story. Now we have Hindi as a national language but most of us in general don't have Devanagari script keyboards. Also some south and east Indians find it difficult to adjust to Hindi. We definitely have our ancient national language Sanskrit but that is more or less in either prayers or only in school textbooks. And most Indians have kind of forgotten to speak Sanskrit anyway. Its now a cultural icon for us.
English was kind of enforced on people so that it is easier to interact with international community. Hence English.
Now imagine if we all were writing in Sanskrit here; we would not be having other nationalities here, isn't it?