Are some people too shy to engage in PDA?

Anonymous
I've just realized I'm too shy to engage in PDA (Public Display of Affection). I realized this yesterday when I took my crush home and she started being affectionate in public on the train. I didn't know what to do in return. Partly because we had an audience and I didn't feel comfortable returning the gestures Are there people/couples who are actually too shy to engage in PDA? Is my behavior normal?
Are some people too shy to engage in PDA?
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