Has this happened to anybody else?

So i've always hated fingering myself. I never found anything particularly good about it so I always went for clitoral type stuff. My ex tried fingering me, and it just hurt. This always scared me because I always wondered "What if I just can't enjoy this. What about penetrative sex?" But my current boyfriend tried fingering me, and made me orgasm in like five minutes! I was so, so surprised. I can't even do that to myself, and I know my body more than anyone else. Has this happened to anyone else? Is there an explanation for this? I'm certainly not mad about it, i'm just so surprised that he can finger me and it feels amazing but when I do it, it just isn't right and almost hurts.