Questions: Dating

Been dating a girl since late September, and last week she lets is spill that she is seeing/texting other guys while dating me. She states that she is 30 years old, and says something about her biological clock. So she is dating a couple guys at once, but I didn't ask how many. She says that right now I am by far the best man by miles compared to the other men, and she has only kissed me, and no other guy. Is this normal? I only ask because I am a doctor that recently graduated from residency, and spent the last 12 years under a rock in the dating scene.

So is this normal for women to do this? I don't feel like it is normal, or acceptable to me? Do I have the right to be upset? She sounds like she is just looking for the next best thing. I am right?

I am scared I am going to become that lonely, bitter old man without children or a wife. I am especially fearful of the day my parents are no longer here, and I will not have a shoulder to cry on.

I am 29 and never had a real girlfriend. I, thank God, managed to find a small Bible group with single friends. Of course, things can change as time progresses, and they may eventually end up married too.

I only want a woman without a romantic past where we can be each other's first real relationship. Seeing that I may not ever find that, I risk being alone for life.

We've only been fixated on this tragedy for, what 36 hours now? Can we maybe try to find something else to talk about? What do you think?