I started out as a sub and began switching much later, I think that being a dominant or submissive is as much about the particular chemistry between the individuals as it is about either of their inherent nature. It is extremely rare for anyone to be submissive all the time to everyone, so calling someone "a submissive" rather than calling them "someone who can be submissive under the right circumstances and to the right person" greatly and misleadingly oversimplifies a highly complex and varied inter-personal dynamic. Rather than seeking to apply a label, sub, switch, or dom, you would do better to simply accept that you are who you are and explore what that means embracing whatever makes you happy. If that means you end up a collared slave so be it since it will have been, ultimately, you embracing who you are rather than trying to maintain an image of yourself that may not be a valid reflection of your actual nature.