I'm unable to have sex. Please help.

Hello and welcome to EmpowHer,

Sometimes the vagina cannot be penetrated do to the way it developed from birth. Here are a few ways it can develop that can prevent penetration:

--Annular Hymen: it forms a perfect ring around vaginal opening. The hymen may lose its shape with exposure to masturbation and sexual activities, but sometimes remains too small to allow for penetration of any kind.
--Cribriform Hymen: The second image is a good example of cribriform hymen, which is characterized by small holes that allow menstrual fluid to flow out of vagina. This makes tampon insertion and sexual activity a bit difficult.
--Septate Hymen: a septate hymen that has bands of tissue that extend across the vaginal opening, but the tissue can be quite rigid and thick. This makes penetrative sex a bit difficult, and you may also find it difficult to insert a tampon as well. The bands usually break on their own.
--Imperforate Hymen: This type of hymen completely covers the vaginal opening, and it can even stop blood flow during menstruation. It is important to undergo a surgical treatment to correct it, or else menstrual blood will accumulate within the vagina and cause serious health problems, including infections and endometriosis. Only 1-2% of women have this type of hymen.

There is also Vaginal Agenesis, which means improper development of the vagina itself. This can also hinder penetration.

These are all issues that can be easily diagnosed by a gynecologist. So, I highly suggest you see one in order to find out possible reasons you are having this problem.

I hope that helps.
Faith