For the past 5 months or so I've been noticing that my sex drive has started to decrease. Everytime I try to have sex with my fiance I've not been able to get turned on enough to be able to do it properly. We always have to use some type of lube and even with that I still feel like my body isn't actually turned on. I feel like it's starting to ruin things. I feel like I'm not pleasuring my fiance enough. Why can't I get turned on? Is there something wrong with my vagina or could it be a hormone problem? By the way I'm only 18 so there should be no problems right? I need some help please!