Well if you say so. I am just worried about you getting kicked out of your home. Anyway, now that you are 18, I would see a psychologist that specializes in gender/transsexual issues. I am assuming your family has health insurance so when they get a letter informing them of your therapy, which the insurance company will do, just tell them you are stressed out or depressed and that you are paying the co-payments. That would be step one. Starting HRT takes a lot longer than most t-girls and guys think. So be prepared to wait for like 1 to 2 months, after first seeing your therapist, to actually see an endocrinologist and start low doses of estrogen and AAs. Depending on how they deem your readiness and dysphoria.
I would be careful though. It's great to do the things you want to do, but it's a hard trade off for family. If you can gain their support, it will make the world of a difference in your transition.