Sometimes it's necessary to disappoint your loved ones in order to achieve happiness. Just don't harm yourself. That would be going to far. But wearing the clothes and making the art and just being you....that is OK. It's you, and no one should try to deny it.
It is hard to deal with the pressure of being stuck between worlds, but you can't let someone stuff you into a white box of plastic. You have to break free and show your true colors...or, in this case, darkness.
The ones you love will rebel. They may beg and they may cry, they may say that they're afraid you'll die, but they have to accept you for you, and if they don't then how can they say that they love you? What they love now is not the true you. They love a plastic robot who is struggling to keep the foam smile from falling off of his face.
They need to accept you for who you really are.