Why can’t I finger myself??

I have tried many times to mastubate but it hurts when I try to add the second finger. I can add 1 finger easily but when I want to add another one, my vagina just doesn’t allow it like I guess its to “tight” you can say. It worries me because what if I’m with a dude and he tries to finger me but it won’t fit or hurts to much. Also like I’m a pretty horny girl but thanks to this I can never finish and its just frustrating because it’s all building up and I just want to finish for once. Is there something wrong or Am I just putting a lot of pressure on myself? Am I the only one with this problem??