Too many problems trying to have sex. Help??

Before I lost my virginity, I was very tight. So tight, nothing was going in there. And after we worked at making it looser, we were able to have sex a lot. And then all of a sudden I started having panic attacks about 10 minutes into the sex. So we stopped having sex for a few months. And now whenever we try to have sex now, it's like nothing can go in there anymore. It's this awful burning piercing feeling, even if he just uses a finger. I don't know what to do or how to even approach this.