Welcome, Steph <3 I'm currently younger than you, I'm 19, but I know how you feel. I'm lesbian too, and my current girlfriend isn't happy with the way I crossdress. I can't ever tell her about the real, female, me, or I'd lose her. I've always had a female personality, even now, and I've always had female friends, always felt closer to females. I've always felt I wanted to be female too, but I've grown up in a family which new or different is bad, and live with the status quo. So I have always pushed in the back as well.
This website has been such an eye opener for me, and has helped me so much, I'm really hoping this helps you. We're always here for you if you need us, love <3