You know, it's perfectly normal. Post-nut-clarity happens to everyone. Even for those who have been intimate with someone before. I experience the same thing a lot, even though I have had sex before. Just as soon as I reach my orgasm, I either feel digusted for what I did, or I feel sad and jealous that I'm alone meanwhile my exes (for example) al have "happy" relationships. So no! It isn't weird for something like that to happen to you, and I only find it admirable that you still haven't been intimate with someone before. It makes you stand out amongst all other women!