Introduction
One of the major languages of the world, German is a native language to almost 100 million people worldwide and is spoken by a total of over 130 million people. It is the most spoken native language within the European Union. German is also widely taught as a foreign language, especially in Europe, where it is the third-most taught foreign language (after English and French), and the United States. Language has been influential in the fields of philosophy, theology, science and technology. It is the second most commonly used scientific language and among the most widely used languages on websites. The German-speaking countries are ranked fifth in terms of annual publication of new books, with one-tenth of all books (including e-books) in the world being published in German.

Ways to learn:
Be curious
Being curious about a language will instill a passion for learning it. The curiosity of the world will ignite you to travel. Travel will make you curious about the culture and history of a country. Culture and history will make you curious about the language.
Devour every German word spoken your way, and when you come across something that you don’t understand, be curious enough to open your dictionary.
Read books
Reading is so beneficial for language learning. You must dislike reading materials in the German language or also you think it is hard to read German However, once you started choosing reading material on your own, it became a fun way of learning the language.
Music
Music is also the best tool for learning a language.Music offers many advantages for learning languages. Scientists have shown that listening to a song and humming along can help with language learning! … When singing, we try to reproduce sounds and tone, so our accent is less pronounced than when we speak
Get out there, learn about these different genres and find some songs that you love. Once you find a song you cannot stop singing,and by singing it you will improve your pronunciation and vocabulary.
Component of easy learning
There is three essential components to learning a German language in an easy way:
Motivation Persistence Method
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Read children’s books in German.
You can continue your training with reading on a Kindle. Why a Kindle? Because it has an integrated vocabulary that allows you to see a word’s definition by simply tapping on it. Use flashcards for the German words that can’t seem to stick.
Train your ears with TV series, movies, music or short videos in German
Watching German movies, TV series, short videos or listening to German music will increase your concentration on learning German.
Talk to yourself in German.
-If you can’t find any online friends to help you practice German, you can even talk to yourself. Not by yourself, but to yourself.
Time is taken to learn
There are many factors that depend on learning German. But at the age of 18, you must have to be dedicated to your learning. Time taken to learn depends on how you manage your time and how short time you will take to complete your everyday task related to German learning.
To learn German at a faster pace, make sure you focus on producing language (speaking, writing) as much as you focus on receiving language (reading, watching TV, listening to podcasts, playing with apps). Don’t make the common mistake of choosing one group over the other, which will make having a regular conversation almost impossible.
I would recommend devoting at least 20-60 minutes a day to active German practice. This could be writing a diary entry, having a speaking lesson, reading a simple news article and testing yourself for comprehension, or watching a video in German to see how much you can understand.

With these simple steps, you can Learn German by Yourself at the age of 18. Always be motivated and confident in what you are doing.
Best of luck!!!