Pain during insertion

Hi, I recently started having lain during sex and i don't know what could be causing it. My boyfriend recently came back from being abroad, and so we had sex the day he got back, and it hurt a little the first time he put it in me (we've had sex before). Throughout the week, we had sex at least once a day, and it kept hurting a little when he first put it in. But it would stop after that and didn't hurt during sex.

But toward the end of the week, it got really bad and wouldn't stop after the initial insertion, and so we've taken a feee days off.

But I'm nervous and need some advice....don't want to go to the doctor cause I'm on my parents insurance.

No other symptoms, it looks and smells and feels fine down there other than just during sex. It's a very sharp pain near the opening but slightly inside, kind of near the top/front wall. Any idea what it could be? Thanks so much