pain when i finger myself helllpppp.

i’ve been masturbating for a while but just by rubbing my clit. i wanted to try and finger myself just to see what it felt like but when i put my fingers in, it burned. i went for a little longer and the burning wouldn’t go away. i washed my hands before so it’s not because they’re dirty. i only used one finger so i don’t think it’s from me being too tight. i’ve used other things other than my fingers and it didn’t hurt at all. (yes these things were clean i didn’t just pick something up off the floor and shove it in my vagina) i’m scared that when my boyfriend wants to finger me it’s gonna hurt and he won’t be able to do it. does anyone else have this problem?? why does this happen ?