I'm not going to even get started about how poorly-informed you are about the subject, mostly because a.) you've already made up your mind about how correct you are, and b.) I don't have to justify my existence to anyone.

I'll just leave this here, from the American Psychiatric Association, and point out a specific response from page 3:

Is being transgender a mental disorder?

A psychological state is considered a mental disorder only if it causes significant distress or disability. Many transgender people do not experience their gender as distressing or disabling, which implies that identifying as transgender does not constitute a mental disorder. For these individuals, the significant problem is finding affordable resources, such as counseling, hormone therapy, medical procedures, and the social support necessary to freely express their gender identity and minimize discrimination. Many other obstacles may lead to distress, including a lack of acceptance within society, direct or indirect experiences with discrimination, or assault. These experiences may lead many transgender people to suffer with anxiety, depression, or related disorders at higher rates than nontransgender persons.

Emphases mine to point out specifically how incorrect you are.

If you're actually interested in learning more about trans people, what it means to be trans, and how to treat trans people with respect, then let me know. Otherwise, I think we're done here.