Anxiety

I grew up in a religious household where sex was something that only a married husband and wife did. I’m 23, in a serious relationship, and not necessarily living the “religious lifestyle”. I have so much anxiety over sex! I feel like to a certain degree I feel guilty...? I’m Trying to figure out what I’m even feeling but I want to be more open with the sex conversation. My boyfriend grew up in a very different family dynamic and I don’t even know where to start this conversation.... but I want to be more comfortable talking about sex and trying new things but I’m lacking confidence. It’s not something I’m used to being open about... any advice? 😩😩