Told my mom I lost my virginity

I'm a month and a day away from being 18. I have been with my boyfriend for 10 months and have known him for over a year. That might not be enough time for some people but I felt ready and I don't regret any of it. We were both virgins and had sex this past Saturday. I was so scared to tell my mom. I tell her everything. We talk like girlfriends. I don't do reckless things because i know how bad consequences can be. Stressing is very common for me, so i really don't do anything that could get me on trouble. I told her today (Tuesday). She acted like I had done something absolutely terrible. I was bound to have sex eventually. And she knows my boyfriend will never do anything to harm me or treat me wrong. She acts like I betrayed her. I feel as though she can still be a little upset with my, but I am my own person and I waited until i was ready. Plus I did it with someone I love and trust. I feel as though she will always treat me like a child and it is so frustrating.

(Sorry this is so long but i just needed to let it out)