Orgasm troubles

Hi. I'm 18 and I'm not a virgin. I've had sex with different boys and I've never had orgasm during sex! The only way is masturbating but fingering never turns me on. Is there something wrong with me? Is there something I can do about it? This may sound stupid but is there any chance that I couldn't have orgasm because I didn't really feel anything serious for the guys I slept with? I mean it feels good to have sex just not as good as I would expect... Help please I'm kind of desperate...