vaginismus advice

Hiya, I'm 17 and I think I have vaginismus. I've never ever been able to insert a tampon. My boyfriend tries to finger Me but he can't get far as feels like he's hitting a wall. The pain is unbearable. We've tried to have sex but it's impossible. I'm gonna go doctors about it but I'm really anxious about what to expect. can any one tell me what might happen etc etc. I'm so scared and feel so down about it all.