I would be one of those people who take control without much trouble in my vanilla life and find that I crave the balance submission brings to me.

I have had several opportunities to Top and even Domme. I have been told that I am good at it. Natural.
But it drains me. It saps my energy and creativity. I am experienced enough to know now that it happens and I therefore very, very rarely indulge in that. It sometimes even has a negative influence on my submissive self. (Telling myself: He probably doesn't want to answer your message/email because you drive the right out of Him!)

So, because I CAN and sometimes DO top, does that make me a switch? No.
Why? Because it doesn't add to my life/relationships. It takes away.

For me, in the time of first exploring, the most difficult feedback to accept was being told that I couldn't be a true sub and also Dom.
People in this lifestyle can be the most critical of those around them. Surprising when you consider they themselves are on the fringes of what's considered 'normal'