Why do I struggle to hold a conversation with her?

There is a girl I like. She likes me too and what her friends told me she likes me for some time. We got closer and we kissed few two times. But we often run out of things to say. We our still pretty nervous around each other. I often dont know what to text her or ask her. Sometimes it feels we really struggle at conversation

Why do I struggle to hold a conversation with her?
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