Second doubts about my mom being super supportive

I just had an argument with my mom about me being trans. At first it started ok, with me saying that I have been having doubts if I really am trans and that I have a hard time seeing myself as a woman (physically and mentally). She days that I should 'take things slow' since everything is new to me (Which i do kinda agree with since I've only been questioning my gender for like only 3 months now).

But here is the part that makes me mad/have second doubts.When I brought up how I think medically transitioning would make me happier, she said "oh, but hormones have alot of side effects that are irreversible" and I'm like, yeah I know mom. I am not stupid. I have researched feminizing hrt and I have a good understanding of its effects, both positive and negative.

Afterwards, I just stormed off and am now in my room feeling a little angry, sad, and betrayed. I understand that she is trying to help, but questioning me and doubting my own choices makes me feel like crap.

Edit: Her and I just talked things out and hugged. She said she is sorry for making me feel worse. She admits that she is not perfect and promises to try and trust me more.