AITAH for feeling uncomfortable that my gf talks about our sex life with her friends?

I (27) came early from work and my girlfriend (27) was home talking with her friend on the phone. I guess she didn’t hear me come in, and I overheard her talking with her friend about sex. She was talking about things we did and details about myself. I felt exposed in the moment.

Later that night I decided to ask her about it. She replied nonchalantly. I asked if her she talks about it often and if she talks about me. She answered yes, sounding a little annoyed. I told her that I felt uncomfortable with her doing so. I felt like my privacy had been violated. Sex is very intimate to me, so her divulging our activities together feels like my vulnerabilities have been left open to the outside world. Our bedroom is supposed to be a safe space yet the whole time there were other eyes watching.

She said that I was overreacting. She told me that it’s normal for women to talk to each other about this stuff and that she has a right to talk about her sex life. I told her that it isn’t just her sex life but mine as well. She called me controlling and has been aloof since.

Am I being too sensitive? Idk if this was a boundary I was supposed to establish beforehand I assumed it was just common courtesy between partners.

I just feel like my trust was broken and honestly I’ve lost all desire to have sex with her.