Tampons & Sex

Hey girls, I literally cannot for the life of me insert a tampon!! I've tried absolutely everything and I need help on how to insert one because every time I do it hurts so much.  
Also on a completely different topic, I am a virgin and I am scared because my boyfriend wants to have sex but I can't even put a tampon in (which is tiny compared to him) so how the heck is he meant to fit inside of me?! 😂😂 man I really need help