How much can a normal vagina fit?

Celeste 💕 • I'm new here! I love korean fashion and kpop!
I'm pretty sure I vaginismus (although I am a virgin and have only used tampons once in my life so I cant be sure) and I would like to know how big of an object a normal vagina can fit without pain and without being aroused. A bit TMI and I know it varies but any comments would be appreciated ❤️