Telling my mom..

So me and my mom are pretty close when it comes to most things, but she has never really talked to me about intimacy in relationships. I never got "the talk" from her, only just that I shouldn't do it until I'm married. So I learned everything from my friends or my own research. Sometimes I feel like my mom is judgemental and so I'm afraid to tell her the truth. However, I just wana tell her so I don't feel like I'm hiding that from her. Also, she has always helped me figure out everything else and find the right doctor or help me figure out appointments and she refuses to help me with going to the gyno because she says that's only if you've had sex and then she gets mad lol..idk I feel like if I tell her it could bring us closer together in the long run, and if I don't then it's going to keep weighing on me. And if I do tell her what if it separates us more? I know she's not dumb and she probably knows already but she's just trying to deny it to herself. I need advice or help on what I should do and how to go about doing it.