Sex Help!!!

So, sometimes I feel like my boyfriend gets bored of pleasuring me because my body takes so long to react. But if he doesn’t finish the job, I get emotional and angry. I feel like I want sex 24/7, and I don’t know what to do. He’s also very insecure about his performance and we both have had no sexual experience. Our first time didn’t go very well, because he couldn’t stay erect, and we didn’t know any easy positions. I’m also frustrated because when I tell my bf how I feel, he takes it personally because he’s a sensitive guy. Any advice for my sex life?