well i’m guessing you’ve been talking to this person otp for most of the time, but i would think that the reason why you’re nervous is bc you’re trying not to mess things up, or to say something weird that might mess up the moment. the feeling in your stomach is what’s called “butterflies in your stomach” meaning that funny feeling you get when you’re nervous about something. the best advice i can give you is to just watch their body language and try to make throngs a little more easy for them so they feel more welcome like they normally would texting or otp.