Dear John，

I’m sorry to hear that you’re not interested in your college major。 。。。

Yours，

Zhang Hua

One possible version:

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Dear John，

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I’m sorry to hear that you’re not interested in your college major。 Since you have no interest in it， why not talk it over with your teachers? Maybe they will give you some practical advice。 If you can’t change your major， then try to accept it。 As far as I know， quite a few college students don’t like their major at first。 But after a period， they may gradually show interest in it。 In my opinion， you should try your best to learn it well。 At the same time， you can study your favorite subjects in your spare time。

I hope you will find these proposals useful， and I would be ready to discuss this matter with you later。

Yours，

Zhang Hua