Hello,
The ridged bump in middle can be the cervix. However for the bumps inside vagina, these can be even cysts and exact diagnosis can only be made after clinical examination. Your cervix will feel firm maybe a little rubbery, like the end of your nose if you put your finger on the tip of your nose and push gently. There is also a depression in the center, this is the opening to the uterus.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.