Never had a boyfriend...Will I ever get one or will I be alone the rest of my life?

I'm 20, about to be a junior in college and I attend a big university, so there SHOULD be plenty of opportunities. I'm funny, easygoing, nice, pretty (not trying to sound conceited or anything just being real), thin, almost 5'8.. The only thing I can think of is that I'm a LITTLE quiet and shy when I don't know someone, but it's not that serious Im not one of those girls who can't hold a conversation because I'm so scared, I'm just quiet if I don't know someone. Anyways, I've "dated" guys, but not often and it never goes anywhere. I do kind of have high standards...but they aren't unreasonable or anything. I just feel like I'm missing out and it seems like everyone at least has or has had SOMEONE in their lives. Yet, nothing ever happens with me and I'm beginning to think that a pattern is developing and nothing will change. Does or has anyone ever had this problem? 20 years old and never had a boyfriend... Or am I doomed for the rest of my life?