Your gender is between your ears, not your legs. If you have a female brain, you will always have a female brain. What you do or do not do to your body is up to you, and you alone.
I have always been transgender, but I did not feel it necessary to transition until I was 43. Keep in mind that GD can be progressive, and your needs today may be different from your needs in the future.
Hugs,
Jill