I don't know what the OP's motivation is, but in many states you can practice (and charge for) "energy work" without license or certification, whereas "massage" is regulated.
Cupping is classified as massage therapy because you touch the body with your hands or hand-operated simple tools with the intention of manipulating the skin and muscles. In a few states (and I don't know about Texas,) cupping is specifically excluded from MT scope of practice, so check your state rules.
It would never be (legally) classified as "energy work," but it does certainly move blood and qi, having a particularly strong effect on "seforum.xxxnation" which are somewhat energetic concepts.
Personally, I mostly use cupping on triggerpoints, spasms and adhesions, all very physical applications.