Scared of sex

I'm really really scared of having sex.. I'm scared that it's going to hurt me, or that it won't fit and I won't ever be able to do it. I've tried fingering myself, and I can do one finger and it feels good but I feel like I need something more but I can't fit in two. I don't know how to explain this. I can move my finger around in my vagina and there's a lot of room, but when I try to put anything bigger than one finger, it's like it won't go past the entrance to my vagina and won't go in! It kind of feels like there's a bone there that's like making it impossible to get anything inside. I feel like, if I could get it inside, then the inside is fine and it's not too tight or anything, but I can't fit anything in without it feeling like it's literally going to break or something. Does that make any sense?? My boyfriend is 6 inches, and pretty thick. That would be a great size for any normal girl, but I'm afraid that it isn't going to fit and that I'm not gonna be able to have sex... For reference, I'm 16, and I've been fingering myself since I was 14 and I've still never been able to get anything into my vagina, really. Oh, I've tried a mascara bottle, because my friend told me that that would feel good. I tried to put it in, and it did fit, but once I started going with it it just felt really really painful and it felt like I was kind of being stabbed, and then I had really really bad pains afterwards. I'm almost 100% sure it was because the bottle is hard plastic, and that hurt me, but she said that that shouldn't have happened. Is this normal? Everyone tells me that I will be able to have sex and that I'll just have to use a lot of lube, but I don't think so. It's not that things hurt when they're going in, it's that they just won't physically push inside me. Sorry for all the graphic detail... But can someone please help?