Receiving these emails does NOT mean you aren't a member of the club anymore, or that you need to re-join.
Most likely, you signed up to learn about the club or get Angela's resources using one email address, then joined the club with a different email address (perhaps a school email and a personal email.) Our email system isn't set up to recognize that you're the same person.
All emails about joining the club have a link near the bottom which says "I already joined the club and got this message by mistake." Click that link and you will be removed from those messages while still receiving the ones that are relevant to you.