ready for sex

this is going to be kind of long and i’d appreciate if you’d spare me on the obnoxious and harsh comments, but my boyfriend and i have been together for over a year and a half now. i’m 18 and he’s 19. we have had the discussion of sex before and attempted to do it twice but when we do, i psych myself out and we don’t. recently he’s been getting frustrated which is understandable, but when i try to explain to him what’s going on in my head he seems to dismiss it. he says he doesn’t understand it so therefore it doesn’t make sense and gets mad. i tried to explain to him that i’m not very confident in my body so i don’t know if i’m ready for that step and he said “he doesn’t want to have sex with my body he wants to feel the connection with my mind and soul” and when i asked him to tell me what that means he said he can’t explain it. i know that this whole situation sounds crazy and stupid, but if anyone has any advice i would appreciate it greatly. i truly love him and picture a future with him but idk how to work through this seeing as trying to talk gets us nowhere.