The use of lube

I don’t use lube but I am planning to buying some due to the fact that I cannot let him in. Even if I naturally lubricated. I do get sexually aroused but then again I get dry after a while. So Ik I need to use lube to help when it comes to having sex. Plus I haven’t done anal sex yet and my partner is always flipping me onto my stomach and try hitting it from the back. But he can’t cause it hurts due to me not being wet enough.

And since I can’t get fully wet or even stay wet… I also haven’t orgasm yet. I always feel like I’m getting there but nothing so does lube help with that? Does lube increase the intensity of making me cum?