New to sex and I'm dry, HELP?

I'm new to sex and lost it to my ex-boyfriend. He understood me hurting for the first few times and slightly being dry. Well we've been seeing each other without a label and it's been going great until yesterday. He told me appreciated me and everything but that I needed to improve sexually. I didnt take it personally until he said it again n said if I wanted to be in a relationship with him that I needed to do that. I get it, but I took it personally and I dont know what to do. He tells me that I'm always dry within 5 mins and that he gets hurt because he feels that I dont feel that I like him the way he likes me. That kills me and like I said idk what to do cuz I'm new to sex and how do I stay wet? Please help, I dont want it to end cuz my body isn't doing what my mind feels towards him.