What is gender dysphoria? And how do you know if you have it?

If you identify as female and like to dress but live in the world as a male and keep the female side under wraps and let not a soul know about it are you still prone to gender dysphoria?

If your content living as a male and are married with a child but have an intense need to dress up as often as possible and find yourself buying more femme clothes than male clothes are you suffering from gender dysphoria or an extreme case of crossdressing?

Can anyone answer these question to the best of their knowledge?

Thank you!

Emmi