Courses online in English for a special needs student?

I am 28, I have autism and learning English, I have advanced enough to take a subtitled English course (not without subtitles). 

What kind of course do you recommend? If ever you studied one. I get anxious if I have to interact with others, so If the course is all on my own better.

Thank you, I send my heartfelt greetings and hugs to all of you. 

Update:

I am Japanese-native language and haven't found free courses of Japanese Universities. 

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