Can’t get it in?

I’m in a long distance relationship right now so when he comes to visit me when he can, he sleeps over my house (I sneak him) both of those times, we’ve tried to have sex but he can’t get it in. And when we’re about to, it hurts. I’ve only had sex once back in July but he forced it in. I’ve tried relaxing but it just ends up hurting. Once I get a car I’m going to go visit him and try to spend a weekend there too but I don’t know what to tell my parents if they ask. I was thinking tell them I’m staying w my cousin since she goes to college in the same city. It wouldn’t be a lie but I would be spending the night with him so if you have any advice with that too I’ll take it😂