Oh, hon! Just to get this out of the way first, you're beautiful. Yeah, it could be taken as lip service, that anyone with the courage to transition is inherently beautiful. They are. But I just looked up your posts to refresh my memory, and you're gorgeous. I do not think you have anything to worry about on a physical level. You are already a beautiful woman.
But I feel so much for you. At 21, to feel like you don't have the support of your parents has to be such a weight. Yes, you are an adult- you can do this on your own. But when you're so young, and when you don't have your own family yet, that parental approval is something we so badly want, and convince ourselves we need. Having to transition between genders is tough, and pairing it with the transition to an adult life is certainly not easy. And I know from experience- having people who pop up and challenge your transition when you've been having a good streak can be such an emotional nosedive.
You have to be strong, and I know you will be. I hope your parents turn around. If your dad was supportive in the beginning, there's a chance he can turn around later, too. Everyone has a different grieving/coping process, and sometimes we have to go through a cycle...even if it means saying some harsh things we wish we didn't. Just remember that they're you're parents. They love you, and while it's difficult to understand, they're motives are rooted in love, even if they are a bit misguided.