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A language is not considered international just because a great number of people speak it. An enormous number of people speak Chinese, but Chinese is not the most important language in the world. The main reason for a language to become international is power – the political and economic power of the people who speak it.
Britain was the world’s leading industrial and trading country in the 19th century. It colonized many other countries where English is now spoken. The North America economy is growing fast, making the USA one of the most important and powerful countries in the world. These are the reasons why English is a global language.
Like anybody else, you need a global language for communication, not only today, but for your future as well.
The sentence “the most important” (line 11) is a superlative adjective and follows the same rule as “the most powerful”, “the most comfortable” and “the most intelligent”.