May we please simply cut to the chase? We Volunteers get new bloggers here every day - day in and day out "testing" this that, etc. and we are glad to help despite that fact that they don't use the learn WordPress.com tutorial prepared by Staff. Your RSS feeds are valid and operational. I know because I checked them out. You ask about others receiving your posts in your RSS feed by email, so here we go:
You cannot subscribe behalf of anyone other than yourself. They must do that themselves.
You can set up email subscriptions by using this guide > http://en.support.wordpress.com/widgets/follow-blog-widget/
If you would like a follow button to appear on the bottom right hand corner of your site for those who do not have WordPress.com accounts see here >
You can customize a contact form http://en.support.wordpress.com/contact-form/
You can use Find Friends Who Use WordPress > http://en.blog.wordpress.com/2012/05/01/find-friends/
See also Inviting Contributors, Followers, and Viewers http://en.support.wordpress.com/adding-users/
Note: As a spammer prevention you are limited to sending out 10 invitations at one point in time.