Tampons

I need help guys!!! I’m 15, I’m a virgin, i have insanely heavy periods, with paralyzing cramps. I want to use a tampon, but it hurts going in. I can only get it like half an inch. Any advice?? Does it make a difference wether or wether not I’m a virgin? Honestly I’m kinda scared to use tampons as well. Any advice for that?