Allow me to help you correct your question :-)
For you, what is it that makes you want to learn English?
Erm....I am English so.....
But the reason I learned Chinese was because I have been interested in Chinese culture ever since I saw my first Bruce Lee movie :-P
The reason I am learning Japanese now is because I have also become interested in Japanese culture as I studied two Japanese martial arts (Aikido and Ninjitsu) until I was 21.