Orgasms

I can't orgasm while having sex I'm not sure exactly why i use clitoral stimulation and everything but for some reason i just simply can't it doesn't really bother me too much because i still enjoy the pleasure of it all but it really bothers my boyfriend and he tries so hard to get me there but it just never happens and he feels guilty when he does but i don't then makes up for it with more foreplay is there any way to solve this? I don't really mind but i think it makes him feel like less of a man because i can't