要用英语表达“我没兴趣”，你可以使用以下几种方式：

  1. I’m not interested.
  2. I have no interest in that.
  3. It doesn’t interest me.
  4. I’m not into that.
  5. I’m not interested in doing that.
  6. That’s not my cup of tea.
  7. I’m not keen on that.
  8. I don’t care about that.
  9. It doesn’t appeal to me.
  10. I’m not fond of that.

根据上下文和语气，你可以选择最合适的表达方式。