What Causes Vaginal Pain While Having Sexual Intercourse?

hi,i m 21 years old girl, itss is almost 1 yrss i have having sex intercourse with my bf but today alsoo it reallyyy get pain on my vaginaa and when my bf ready to insert his penis into my vagina then i dnt let him to do thiss to him becausee it really painnn my vagina are so tight that his penis cant insert in my vaginaaa.i am really worried abt my vagina ..why this all happens to me and why i feel soo pain on my vagina during sex intercourseee.does it mean that my hymen are still not broken or whattt,,,pleaseee give me some best suggestion i m really worried abt it,,,,