Hey Ellie, (which is a beautiful name, by the way

)
Yep, that jealousy. I know.

Before I began transition I considered the same. Moving away, once I'm old enough. Save. And then get it going. I didn't wanna tell my family at first, and I wasn't sure about some of their reactions. Eventually I ended up coming out to my mother when I was 16 in order to get the hormone blockers. The fear of puberty and its irreversible effects made me too sick and depressed. It took me another year until I went full time, but everybody surprised me by how supportive they were.
In the meantime, I tried to become androgynous. Got a nice pixie cut, got myself gender neutral clothing. (And sometimes people already gendered me correctly. Ouh yeah!

) That was a big relief and made it easier to jump to the other side later on (not that much of a shock for people around you, as well as much better for your wallet to update your wardrobe slowly).
Also, I told some friends and started to express myself aorund them in private. If that's an option for you, consider it. May be a giant relief too. Even if you're only talking about it. That's great. You can get these feelings out there, share them, throw a little load of your mind.

And ... if you can manage to do that safely and have the guts

, you can get yourself some clothes from the women's section. A dress or anything you're interested in, skinny jeans, a bra, ... and have them for yourself, when you're alone, to see yourself in the right clothing from time to time. That's a relief as well. (You could even try the skinny jeans in public, though that
might go too far if you're staying stealthy for now.)
What brings me to my next point. Practice some things you may need later, already. Gives you a headstart then. One of them could be tucking. Or make up. You could let your friends teach you.

Think about letting your hair grow.
So, heres a short overview for you:
- Try and see if you can get hormone blockers (stay away from self prescription, please)
- Get yourself an androgynous look (clothes, haircut)
- Come out to friends, be yourself with them
- Get yourself some feminine clothing for when you're alone
- Practice what you may need later on (tucking, make up)
I jope that helps you a little bit and inspires you, Ellie.

You're gonna be great. :*