BDSM, In short, it stands for B/D: Bondage and Discipline D/S: Dominant and Submissive S/M for Sadist and Masochist.
One of the strongest foundations for BDSM is consent and safety of all parties concerned. You will hear words like SSC (safe, sane and consensual) and RACK (Risk-aware, consensual kink) thrown a lot around.
Regardless if you eventually identify as a bottom or Top, or the occasional dip your toes in BDSM on either side, or a submissive/Dominant that want to base either their whole sexual side on this or even your relationship. There is a place for you to experience this and be part of a wonderful world of kinksters.
So for the moment, don’t concentrate on too many of the titles or definitions or labels people identify with and just be openminded and respectful.
One thing I can say is that the way YOU experience BDSM would be as unique as you are. There are lots of guidelines and recommendations but it is generally to keep everyone safe while taking part in some activities that have some inherent risk to them. But it is a lifestyle that is allowing you to be you.
So show me a hundred couples involved in BDSM and I will show you a hundred ways you can do it. (You don't have to be a couple to be a part of this kind of lifestyle either)