Is this a normal reaction?

My biggest dream is to be an actress. I finally had the guts to tell my mom and she completely freaked out on me. I simply told her it's something I've always wanted to try and she even let me look on the computer for opportunities to try it. Finally, after reading some websites, she said I needed therapy. That she wasn't sure who I was anymore. That acting was not my biggest dream. I told her, however, that I just wanted to try it since I'm young and not sure who I'm meant to be yet. She just told me that I live in a bubble, a fantasy world. We eventually both calmed down and both cried a little bit. She told me to try community theater over the summer to see if I am even any good at it. She told me that this career was not the one she had ever planned for me as my mother. I had hoped that if I was good at it to try it at my age now, which is 16. If an opportunity presented itself I would want to take it now, but she told me that either way, I would have to wait until the future. She wants me to focus more on school and college, even though I've always been a straight A student. Is this a normal reaction? Do you think she will ever change her mind if I'm good at it now or will I still have to wait until I graduate college? Thanks for answering!