To change your mind, and be willing to change it, is not only possible but necessary for intelligent, thinking people. This is how you grow mentally. You are going to change your mind many times for the rest of your life. You will make 180 degree turns in your thinking on an issue......and often sometime in the future go back 180 degrees. It's common to be very opinionated an a topic for years, and then experience something that makes you suddenly ambivalent about it. It sometimes happens that you will take one position when certain circumstances are present (e.g. you have children still being reared in the home) and then reverse that position when those circumstances change (e.g. the nest becomes empty).
I'm not referring to topics in which the stereotypical ditzy female can't make up her mind. I'm talking about cultural, political, religious, social, and philosophical topics. Sharing, or polyamory, is a topic that falls in at least 3 of those categories. It's a serious topic for any of us to digest and might be one that you change your thinking on more than once.
The day you need to start worrying is the day you realize you are incapable of change. It probably means you're dead. I'm old enough to have experienced a lot of this. You're just beginning. Take my word for it.....it will happen.....unless you're in a coma.
DIXIE