I have social phobia so I avoided...

[Silverobama]

I asked my cousin whe he didn't go to the English clubs where there were many native speakers of English and many people who speak very good English and he could therefore improve his spoken English since he wanted to go to Canada. He said "I have social phobia so I avoided crowded gatherings".

Is what he said natural?

 

[emsr2d2]

I asked my cousin whe why he didn't doesn't go to the English clubs, where there were are many native English speakers of English and many people others who speak very good English, and he could therefore to improve his spoken English since he wanted because I know he wants to go to Canada. He said "I have social phobia so I avoided crowded gatherings".

Is what he said natural?

I have social phobia so I avoid crowds.

Note my corrections to your text above. I've tried to keep your original word order as much as possible but it made for a very wordy piece. Here's how I'd have written it:

My cousin wants to travel to Canada so he needs to improve his English. I asked him why he hasn't joined an English club so he can practise with native speakers. He replied "...