If you're not ready for sex, don't have it. That's probably one of the reasons why you're so tight is because you know you're not ready, you're nervous and you're psyching youself out. Putting tampons in is totally different than sticking other things in with much larger circumfrences. Your hymen needs to break which is the skin that usually partially covers your vagina. the tampon is just small enough to get in without penetrating the skin. It's ok, don't freak out. It just takes time, and you need to be comfortable with yourself, and with him. If you guys don't know me by now, but my biggest thing with losing the v-card is to be sexually comfortable with yourself and with the person you're sleeping with, trusting that person, and being ready to take responsibility for your actions.