Personally, there is no reason why someone will not wish to give their address out. About the only thing I could think of is your email address is linked to your Facebook, or Instagram account, and therefore may reduce the privacy (if you call it that) that you may have. With that in mind, I will suggest that you create an email account exclusively for email correspondences. There are many free email providers which you can look below for a short list of them:
You can use any of the above free providers. If you want to be really secret, you can create a user ID such as 3054ufj29rfj. This will assure that no one can use your new correspondence only address and tie to you.