Welcome to Susan's, Maribeth.
Every time that I see someone as young as you on this board, I get a warm feeling. You are smart to come to grips with your feelings at a young age while there are few commitments (think spouse, children, and other things) in your life.
I would encourage anyone in your position to seek a qualified therapist, psychologist, or other mental health professional to help sort out your feelings. What I mean by qualified is someone who has assisted with someone sucessfully transitioning. I've been to therapists who have the experience, and others who haven't. Believe me, the ones who have the experience are far and away better. You'll find several resources on the internet to help you in your search. Otherwise, post on this board - many of us have been to therapists, counselors, and so on who aren't necessarily listed.
Take it from someone who buried their feelings for decades, you are so fortunate. I want to wish you the best - and don't hesitate to post here with ANYTHING. We're here to support and help.
Carol