[petriw]

I don't know your definition of "very hard" but there are certainly harder languages for a native English speaker to learn:

https://en.wikibooks.org/wiki/Wikibooks:Language_Learning_Di...

Pronunciation specifically can be hard to learn without actually focusing on it, such as recording your own voice or having a tutor specifically teach you how to make each sound. A normal class setting is very bad for learning pronunciation while a one on one conversation with a teacher focusing on pronunciation will bring much better results.