Pain during sex

My boyfriend and I have had sex on a regular basis then about 2 months ago we tried to have sex and it was painful. It felt like a burning not good feeling. We have tried a couple times since but every time it's too unbearable to even have sex. Even when he fingers me it can hurt a little too. That never used to happen! Just all of a sudden one day and I thought the pain would maybe disappear but it hasn't. I NEED HELP AND TIPS. I don't know what's wrong. I would go to the gyno but I am not old enough to on my own yet. I am on birth control I just don't know how to bring it up to an elder.. has anyone had the same thing happen? If so what were your treatments/diagnosis.