Many areas of the BDSM lifestyle can tie into each other. For example a Dominant can also be a Masochist. The only lines are the ones you place upon your relationship. Many practitioners disagree with this as a fundamental deviance of the traditional BDSM norms. I see BDSM as a deviance of the norm itself, thus a great place to trial.
I am the one in charge and I love receiving and giving pain, thus I consider myself a Dominant, but also a sadist and masochist. It took me a while to become okay with being more than a sadistic Dominant, admitting to masochism. I like pain, but there’s something about ordering my submissive to hurt me that still puts me in a vulnerable spot and I don’t like feeling that way. It’s been this way our whole relationship and I still struggle with the concept.
Today I made it a point to reach out to the BDSM community to see what other people struggling with this think and I hope to gain wisdom to remain feeling like a Dominant when I am receiving pain.