If he kisses me on the lips and i don't kiss him back was it my first kiss?

If he kisses you on the lips and you don't kiss him back, it wouldn't typically be considered your first kiss, as a mutual exchange is often what defines the experience. Your participation in the kiss plays a key role in its significance. However, everyone has their own interpretation of what constitutes a "first kiss," so it's ultimately up to your personal feelings about the moment.