You need to know that even a small vagina can fit most any size penis. Think about it. A baby comes through that same canal and it is way bigger than even a huge penis.
I think that your fear of being touched, that you are too small, and so on may be worth talking about. It sounds like you are very frightened of sex, and it isn't clear why. Were you molested?
This could explain your terror of being touched as well as your fear of being too small. If a young girl is forced to have intercourse, her vagina is definitely too small. If you were molested as a child, then enter therapy right now and work to heal. I can help you find someone in your area. Let me know.
If you haven't been molested, then I wonder if you were raised in a very uptight household. Is your mother particularly inhibited about her body and sex?
It would be good for you to understand where your feelings are coming from. This is because the more at ease you are, the better your sex life will be, whenever you do decide to have sex. I think you would also be wise to examine why you think that your vagina is smaller than another woman's?
I assume that you're afraid that you won't be able to fit a penis inside you because of how small you imagine you are. Did you know that fear can actually conceal an unconscious wish?
This is called a reaction formation, and it is a defense that protects us from feelings that we don't want to face. So, if you assume, for a moment, that your fear of being too small to be penetrated actually means that you wish to be too small to be penetrated, then you could begin to examine why, on an unconscious level, you don't want to be penetrated. T
he more you understand yourself, and the origin of this fear, the quicker it will resolve. Know that your size isn't holding you back.