That's what I suspected... you are about start taking hormones without parents support. Yet at the same time you're financially dependent from them.
Scenario #1: as soon as HRT causes changes (and not so drastic, first minor ones), your parents will notice and confront you. They would insist to bring you to a doctor if you play innocence and pretend you don't know, or act as if in denial. Later they will find out that you started hormones without letting them know first. Opportunity to ask them for support is lost.
Scenario #2: you tell them how did you feel since age 7. More likely than not, they noticed something too. But maybe not. They feel hurt and try to make you change your mind, but you remind them you can really make decisions without their consent, yet it would really hurt you in many ways if you have to leave home. You get a job and start planning for your independence. You might actually gain their support somewhere, and with their support you'd be way ahead. And if support doesn't materialize, you will start HRT maybe a few years later, when you are financially capable, but you will have a higher ground than your parents.
Don't underestimate them, don't push them out of your life. Parents are there to help you, not hinder
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