At the age of 3, I suddenly want to compose music by myself and write songs for people I like. Is it still here? Is the idea realistic?
Yes, as long as you want to learn, keep learning and have a strong interest. You can get started. I suggest you go online to find some websites, videos and buy some books on music theory. You can also add music groups to communicate. It is best to know a musical instrument. This is of great help to composition.