My roommates are making fun of me for being a virgin. How do I keep it from bothering me?

I'm 22, and I haven't lost my virginity yet (or had a boyfriend, only one date which was a disaster). It's not really an accomplishment since I've never been propositioned either. I didn't tell them that I was, but they pretty much deduced that I was since they all talk about their lives and I don't. I really love men and enjoy their company, but I haven't found someone that I could love. I'm not doing anything like waiting for marriage. I'm a pionate person and a romantic and I don't want to just go out a lose my virginity to a frat boy who hasn't changed his underwear for 2 weeks. I'm beginning to feel like I'm unlovable. How do I make my roommates' comments hurt less?