Hi Miller,
Yes, it could be your hymen or just a skin flap that was loose. Why on earth would you let him put 4 fingers into you? That is too many to start off with no wonder you are bleeding and sore, you don't even need to use that many for masturbation. Did you get any pleasure out of it? Also, if it hurt you and you didn't telly your bf, how is he to know? You can't assume that guys know what they are doing when it comes to females because at a young age most do not know unless if we instruct them and as you are finding out, the vagina is delicate.
Hope this helps
For way more pleasure one or two is suffice. Do you masturbate yourself at all? If you do, then you just need to let him know what you like and how he should finger you to get you off.
On to the therapist, you can go see your doctor but it'll heal on its own as well. Just make sure you keep it clean and use a mild disinfectant soap in your vagina from now on, this keeps any bacteria at bay or for the most part. I use a finger in my vagina while squatting to lightly clean the vagina out of any accumulation of discharge or sperm, which can leave an unpleasant smell in the vagina.
I think you should get it checked out in case it might be more serious, also for your own peace of mind.
That seems terribly insensitive of him to force 4 fingers in your vagina when he knew you were not used to it. Is he really that unknowledgeable or does he enjoy hurting girls?
Some guys really believe they are supposed to make a girl hurt and/or the girl is supposed to want that to prove they love him.
In my opinion love is supposed to be pleasure not pain, for both of you.