Okay so I have a question about Sex?

So, say you have sex(protected) but during it’s very uncomfortable and your in a whole lot of pain, right and so the person is trying to penetrate you but he/she can’t because your in pain. So like what I’m trying to say is, since the reasoning of pain it’s because you are nervous so does that makes the vagina become tight to when the penis enters it’s impossible for penetrating because the vagina walls won’t open? 😯🤔😕 so that’s my question because I want to make sure I’m right 👀🤷🏾‍♀️