It’s probably because of fircooni and how having sex hurts a lot.
Are your refering to FGM? If thats the case go see an gynaecologist.
Treatment for FGM (deinfibulation)
Surgery can be performed to open up the vagina, if necessary. This is called deinfibulation. It's sometimes known as a reversal, although this name is misleading as the procedure does not replace any removed tissue and will not undo the damage caused
It should ease up the pain when having intercourse and give you a wider opening to cope. Don't let this get you down sis. I've heard of woman who had the surgery and went to on to have fulfilling sex lives with their husbands.