Those are two completely different things.
Your appetite for sexy things doesn't have to match others', but I do want to say that, usually, that's due to hormonal disorders (according to documentaries I've watched) so you should go check yourself with a doc.
It's completely normal for you to not be a lustful beast thinking about dick and/or ass 24/7 (aka me), but if you don't get an erection at least once a day then...
Tbh I'm not the right person to be telling you all this stuff because I'm a horny fucker so I wouldn't know what it is like to have a low sexdrive.