Is it manly to write a letter to the girl you like?

Funny that you should ask this, I was just reading over some letters my ex had written me.... do it! Letters are an amazing way to get your feelings across. You have as much time as you want to say things in the perfect way, and she'll think it's romantic and it's a great thing for her to look back on. If you are sincere in your feelings and she likes you or is interested in giving you a chance, then she'll find it more than adorable (like say romantic, personal, etc). Good luck!