While I completely agree with how frustrating it is to have your parent so hung up on a possible side effect that has just as much chance of not showing up. I wanted to agree with a few other people when I say that the confidence and general just love for your body that T gives you could possibly change your mind about how you identify sexually. Speaking from pure experience, I was asexual too but I was able to become positive about sex and use it now as a tool to feel more masculine by myself or with a partner. This is a lot of sex talk for a 14 year old but what I am trying to say is you owe it to future you to keep an open mind and hear your mom’s concerns if they are valid and she is getting her information from appropriate sources.