First time with a new guy

Hi. I have been seeing this guy for two weeks now. And we still didn't kiss or slept together. We are both horny and we will probably have sex tomorrow. We have connected very well and he is really great. Problem is that I am not really secure about my performance and my body. I don't want to be boring in bed.. Also I have a period now. Should I wait for it to end deffinitly or maybe do it... Aaaa I dont know. What to dooooo? 🙃