Your first paragraph sounds almost exactly like my experience, except for the early female toys.
So you're transgender, no big deal. You know, it's different, and different is usually "bad" when perceived by other people. I kept it hidden for 15 years (btw, that's almost half my life now) because I "knew" it was wrong. Well, now I'm out, and I'm the happiest person I know.
The good news is that just because you're transgender doesn't mean you have to transition, and even if you do, it doesn't make you a freak. See a gender therapist, and tell him/her how you feel. It's tough dealing with the "I don't want to be that" feelings, but I found that if you just accept them, you'll be happier. I spent most of my post-high school life pleasing others, and putting aside what I wanted. Well, now I finally took something that I wanted, and believe me, the feeling is wonderful. Granted, I'm not transitioning yet, but I know I will be, and that is something that keeps me smiling all the time.
Just a few things: be prepared. Educate yourself a bit. Use some of Susan's resources, and be prepared for your family. Want to know why? I'll list my family.
Mom: confused, upset she'd be losing her son, but was 90% sure that's what it was
Dad: has been finding all sorts of risks associated with transitioning and hormones ever since he found out
Brother: "I'll refer to you as my sibling" (yeah, like that's gonna fly)
Father-in-law: Couldn't believe I lied for 8 years (how long I have been with my wife), basically disowned, an embrassment, and apparently was "never part of the family
Mother-in-law: See Father-in-law
Sister-in-law: Won't acknowledge me, also implied I was a pervert, because she accused me of looking through her laundry
That's the basic list. As I said, be prepared. And no, you can't NOT tell them. They'll find out/figure it out eventually. If they haven't already. Sorry.