Dick too big? Is it me or him??? 😩

So my boyfriend and I moved in together a couple months ago and we both have a very heavy sex drive he has a huuuuge dick and lately if we have sex more than once a day or even two days it hurts soooo bad inside like almost like a cut inside of me and we have to stop. It makes me so upset because I really want to be able to have sex but it just hurts so bad. This never had happened before because we’d have sex maybe every few days or so but now it’s just way more and starting to get super painful. Is it me? Is his dick too big? We never use lube because I normally get really wet easily but do I need some? Is that the issue? Or do I need to see a doctor?? Help!! 😫