Shame and self-loathing

Hi, I am writing from a conservative Eastern European country and recently I had a terrible story in which I feel like a monster. I had a good friend who disappeared from our social circle about a year ago and recently returned. As it turned out, he has been suffering from gender dysphoria for many years and is taking hormones to transition. We talked for a couple of days, got close again, and she confessed her love for me, and I, catching the impulse (I suffer from Autism spectrum disorder), agreed. It wasn't until a couple of days later that I realized that I wasn't ready for a relationship with a trans girl (I'm not transphobic, it's just the foundation of my personality). And I tried to bring up the topic that we might have to break up and so on, however, she writes so much about how she loves me, how important I am to her and that I am a ray of hope and understanding for her that I just can't put her off somehow. I'm afraid of looking like a monster in her eyes, I feel the most insane shame, I'm afraid of condemnation from our mutual friends. I made a terrible mistake and I don't know what to do. I'm ready to hear a hundred insults, but I would also like to hear advice on what to do in such a situation? (Sorry for being slurred speech, I'm writing through a translator)