You do not need the classroom. There are many ways to learn languages, especially today.
Study the transcript on LingQ:
0:22 Real learning takes place outside of a classroom.
1:55 3 things enabling you to learn a language on your own.
3:33 Studying in a classroom is fine if you like it, but it’s not if you don’t.
5:03 Formal structured language instruction VS Input based method.
6:39 A little bit of a system won’t hurt.
7:04 Chinese engineers reading cartoons.
8:34 Classroom is optional and not necessary.