That’s correct! That is how email forwarding would work.
When customers email you, they will see the business email address that you created (info@jophermans.com) but when you reply to their message, they will see your personal email address that you have set up, so this may be the downfall here.
I am aware that you would not want to use a third party however it may be the only other option. You can connect your domain to an email hosting provider such as GSuite or Zoho Mail. With email hosting the email address you create for your business will be an actual email address with the same features as a regular email address such as having an inbox. This would mean that even when you reply back to customers, they will only see your business email address! We actually have another guide on Email Hosting also!