I have a size problem

Okay Me and my boyfriend have been together for almost a year🎉🎊 our relationship  is fine but their is something bothering me sexually. So far he has been the smallest I have been with. I have slept with only 2 guys prior but they big had big dicks.with my boyfriend  I don't cum, or stay wet, and after 7 mins I just want him off me. I love him so much, But how do I get over this or make sex feel good for me. 😞