Nervous vs Uncomfortable

So me and my boyfriend have an incredibly comunicative relationship and i told him im not ready to take off my pants just yet, he was cool with it. The other day things were getting heated and i ended up naked, he didnt pressure me in any way. But when that happened i went from dripping wet to completely dry, and im not sure if its because i was nervous or uncomfortable. I just dont know how to figure out what im comfortable with before hand if i cant figure it out durring