Worried

I'm a virgin. Well, today I decided to use a dildo. I put lube on it but had a hard time entering it. I only got the head in and nothing else. It was like something was blocking it and it hurt. I couldn't go further so I quit and I didn't feel any pleasure. I'm worried that when I do lose my virginity that the penis won't be able to go any more than it's head. What should I do? Also, I wear pads, not tampons if that helps. I also don't play sports, but I do stretch and do leg workouts from time to time. I run too. I just wanted to satisfy my high sex drive but that experience was a total mood killer and I am scared. Help, please.