在英语中委婉拒绝别人的表白，可以采取以下几种方式，这些方法既礼貌又能够保护对方的自尊心：

1. 直接但温和的表达：

"I appreciate your feelings, but I'm not ready for that kind of relationship right now."

"Thank you for your honesty, but I'm not looking for a romantic relationship at the moment."

2. 强调友情的重要性：

"I value our friendship very much, and I don't want to ruin it with something that might not work out."

"I'm sorry, but I see us as friends and I don't think it's a good idea to mix our personal lives."

3. 说明个人原因：

"I've been through a lot lately and I need some time to focus on myself."

"I'm still healing from a previous relationship and I'm not ready to move on to something new."

4. 用委婉的方式表达不感兴趣：

"I think you're a great person, but I'm not feeling the same way about you romantically."

"I'm not looking for a relationship at the moment, and I don't think we're a good match."

5. 表达感激但保持距离：

"Thank you for telling me how you feel, but I think we should keep our relationship platonic."

"I'm flattered, but I'm not interested in dating anyone at the moment."

6. 使用幽默来缓解尴尬：

"I think you're cute, but I'm more of a 'coffee and friendship' kind of person."

"I'm not sure if I'm the right person for you, but I'm definitely the wrong person for a relationship!"

记住，无论你选择哪种方式，都要保持尊重和理解，尽量减少对方的尴尬和不适。