I need help dealing with my virginity.?

I'm 19 years old and I know it sounds silly but I feel so embarrassed that I am a virgin. I've never had the boyfriend and when I've had the opportunity, I feel as though I don't know how I would behave in that situation, because of my virginity, so turn them down. As I'm nearing 20, I feel like it's really knocking my confidence. There have been two occasions where it nearly has happened and close friends think it has. I've lied to all those around me to hide my shame, that I now have no one close to confide in. My fear of admitting this to a man is making the problem escalate and now I don't feel as though I'm going to ever be able to face a relationship. I've never known my father and had a rather tough upbringing, being taken into care at 10 years old. Although I've done well for myself and I'm now at University, this is the one hurdle I can't cross. Please help!