Is it normal that i get so scared of love?

I have never been in a real relationship before. This is a guy who lives an hour away by train who I am very friendly with. In the past, we have hung out and it was very flirty. I have liked him about three times, and it always seems like he likes me back. I have a crush on him now, and I think he likes me back. But the thing that has held me back is rearing its ugly head again. I get scared, and nervous. Thinking about seeing him makes me happy and excited, but the butterflies hurt and I feel somewhat sick. Is this normal? What should I do? He wants to hang out soon, and that is the only issue.