how do I tell my partner how I feel??

This may sound daft to some but it's something that has got me down lately and could really use some advise. When ever I'm feeling in the mood and make a move on my partner I'm always told no either because he's tired or for others reasons I don't know but his main excuse is because he's tired, but when he's in the mood we always have sex and it's making me feel that when we have it that it's only when he wants it all the time. I just don't know how to tell him that it making me feel like he don't find me attractive anymore when he's always turning me down and making it feel like he's using me for only when he needs it, foreplay has completely gone out the window and when we have it it's not enough to satisfy me like it does for him as it's over with within 5 minutes, it's like he just doing it to get himself off and don't care that its not satisfying me at all. Any advise would be appreciated.