Virgin girls have a ring of skin called a hymen which partially closes the entrance to the vagina.The resulting hole is too small to take an erect penis. The first time a penis enters that skin must be stretched and it usually gets broken, making the entrance permanently larger. When the hymen breaks it is usually painful for the girl and there is bleeding for a while.
You can insert one finger with the hymen intact but trying with two or more may stretch the hymen to breaking point.
It helps if the boy has spent plenty of time on foreplay, rubbing and licking the girl's clitoris and inserting a finger inside the vagina, sliding it in and out.
For first insertion the boy should lie on his back with his penis fully erect and as hard as it can get. The girl should then 'mount' the boy as though riding a horse. She should position her vagina directly above the boy's penis, take a firm grasp of it and very slowly lower herself onto the penis.
Using this method the girl can control how quickly the penis enters and stop and relax if it becomes painful
Yes it's to paining
Bro When I get nervous like my penis doesn’t get as hard as it usually does when I’m only and like I over think stuff like she might think it’s small