Thanks for query,
I hope you are not on any medication.
Sex is in our mind & not in organ or clitoris
You need to relax first.Think for 2-3 days that you want to enjoy sex.Leave all tension aside & develop a mood for sex.By watching Sexy film or reading sexy novel also work to enhance your mood.
When you get Parasympathetic stimulation in the form of your relax mood you have desire to go for sex.