Your boyfriend does exhibit many of the interests that come with being into BDSM, however it is not uncommon for a person to simply enjoy some fetishes with their normal sex, and do not see themselves as a Dominant.
However, with the large amount of practices that your significant other enjoys, it would strongly seem that he does enjoy BDSM and is possibly just too nervous r shy to approach the topic with you, and would rather introduce you to separate aspects of the lifestyle individually. My suggestion is that you talk to your partner about BDSM, and ask him if it is something that he is interested in. It seems that you are compliant with his current sexual requests, and it would be safe to assume that you would be comfortable with the transition to a D/s relationship, as given your current activities it would seem to only give all of your collective fetishes and activities a singular uniting “title”.
It could also be as simple as your partner simply not knowing that BDSM exists; this is common, and some people find themselves overwhelmed by the huge amount of sexual activities they wish to explore, and simply introduce them as separate fetishes, rather than under the lifestyle of D/s. If this is the case, then talk to your partner about what a BDSM relationship entails, and enquire whether or not this is what he wants.
Have Fun
Sincerely Sir