I feel guilty for disliking my fiance.
Do you really not like your fiance anymore?
Deep down, I wish I could still go on dates with other people. So, yeah.
That's a pretty big deal, feeling like you dislike your fiance. It's wrong to marry someone if you're not in love with them. You need to reconsider this relationship before you get married.
Who cares if I have feelings for her or not, marriage is worth it just to get laid every night.
Marrying someone who you don't love is not going to end well. You are just going to end up hurting your fiance down the road when your marriage inevitably falls apart. Be honest with her and end the relationship now before the marriage.