This happens through HRT, time, life, time, experiences, and time. It's taken me about four years but, finally, I can see myself in the mirror instead of what I used to see before transition. I understand a lot of what Cindy said in her response regarding 'him': the mask that I used to wear. It takes living your life for a while to make that mask fade away into nothingness but, once it's gone and you've done a bit of living as yourself for a while, eventually you stop seeing the mask and then later, you stop seeing what you used to see but think you still do.
I know that response is very metaphysical but we have a persistent self image that we project onto reflections. Once you're done with the process of acceptance of yourself, that changes and you can finally see what everyone else sees.
That said, you're pre-HRT so you've really just started this journey. Take your time and you'll serve yourself well but always, always, always know that you'll get there if you hang on, open yourself to life and love, and keep going.