写英文交友信时，可以遵循以下步骤和格式：

信头

使用“Dear”加上收信人的名字，注意是名而不是姓。

开头语

简要介绍自己，包括姓名、年龄、职业、爱好、特长等。

表达愿意与对方成为好朋友的愿望。

正文

介绍自己的情况，如学习、生活、兴趣爱好等。

说明交友的缘由和方式，以及希望通过交友达到的目的。

可以分享一些个人经历或有趣的故事，使信件更生动有趣。

结尾

简洁地表达祝愿，如“Best regards”或“Wishing you all the best”。

说明期待对方的回信，如“Looking forward to hearing from you”。

签名

使用“Yours sincerely”或“Best wishes”等结束语。

```

Dear [Friend's Name],

I hope this letter finds you well. My name is [Your Name], and I am a [your age]-year-old student from [your city/country]. I am currently studying [your major/field of study] at [your school/university].

I came across your profile on [where you met them, e.g., a social networking website, a forum, etc.] and I am genuinely interested in becoming friends with you. I enjoy [your hobbies and interests] and I believe we have many things in common.

I would love to hear more about your life, your interests, and your experiences. It would also be great to share my stories and learn from you.

Thank you for considering my request. I am looking forward to hearing from you soon.

Best regards,

[Your Name]

```

请根据实际情况调整信件内容，使其更符合个人情况和表达习惯。