I cant cum during sex

So I have been masturbating for YEARS now so I know how to please myself better than a guy could. Well I recently lost my virginity like a little over a month ago but I can’t cum.... I’ve had sex about 5 times now and I still cant cum. My boyfriend is doing it right and everything cause trust me it feels goodddddd but I don’t feel myself cumming ? Is this normal lol. OH also you know how you are supposed to get looser after multiple times of sex. I get tighter like I’m usually still sore, is that normal too? Lmao I sound like an amateur and I am but I’m getting to know my body in a different way so please don’t judge 😂