There is this running idea that what ties trans people together is their dysphoria, their mutual disdain for certain parts of their bodies (which is usually assumed to be genitals). Yet, there are trans people who exist without any pain caused by their bodies. They love their bodies. They embrace them. Are they trans then? Of course they are. Trans is not about dysphoria. This is a common misconception, even in the trans community. Trans is about identifying as something other than what was assumed at your birth.
The origins of this idea, date back to when being trans was first medicalized. They needed a set of definitions in order to treat trans people. Among the need for dysphoria, was also the need for trans women to be feminine and heterosexual. Trans men were to be masculine as well as heterosexual. If a trans person was not straight, their identities were considered to be fetish (for trans women), or just confused straight women with penis envy (for trans men). Non-binary people did not exist, nor did queer binary people, according to the old standards. Definitions and standards created by cis people.
Unfortunately, this idea has remained, in a number of ways. There still exists the idea that for a trans person to be trans, they must experience dysphoria. Of course, this is at no fault of trans people who do experience dysphoria. Cis gatekeepers and the gatekeeping process that originally set up the whole idea are the ones who started this snowball rolling and continue to push this narrative. While the DSM-V has removed Gender Identity Disorder, changing it to Gender Dysphoria, and requiring simply identifying as something other than what a person was assigned at birth (in many more words, many more binary words), many therapists, psychiatrists, and so on, require dysphoria to be considered trans.