Inexperienced during sex or is he a virgin?

My boyfriend and I have been having sex for months now and I can't help but question if I was his first or not only because he is pretty bad at sex. I've asked him before and he said he's not a virgin and has had sex with 4 other people. During sex however he has no idea what he is doing. I on the other hand am not that experienced because I lost my virginity to him but yet the only time the sex is amazing is when I'm on top doing all the work. We've tried many other positions (missionary, doggy-style) but they all don't work because he doesn't know how to do them. Even when we first started having sex he would never actually stick his penis in me. He still doesn't put it in me. I'm the one to put it in myself. He just lies on top of me and starts grinding. I dont know what to do to get him to be better and for him to know how do it better. Should I get him some porn to watch? Also, is he a virgin or is he just really inexperienced when it comes to sex?