Fingering

So I lost my virginity about 2 months ago, and since then when my bf goes to finger me (rarely) it just doesn't feel good and it sort of hurts? Like a light burning feeling? I'm not really sure how to describe it... but I really hate it and I miss it because he used to be so good to the point where I'd almost orgasm (I never have because I always made him stop for some reason...?) 
I need some advice about what this could be/ why/ if anyone's experienced something similar?