Loose weight to loose virginity

Right so in October I'll be 18 I'm still a virgin because I haven't found the one who I feel as though I want to loose it to , I would like to loose it because I am very sexually active however I'm very self conscious with my weight I'm 12 stone which is 168lbs and I'm 5'2ft all my friends are very slim so that makes me more self conscious, my bra size is 36E , I'm starting the gym soon my goal is 10stone , do use think I should wait until I'm 10stone (130lbs) or leave my weight ???