I was 19. It was fun. I just wanted to do it and an opportunity presented itself, so I took it. Was chatting online with a guy from college I sort-of knew, and one thing led to another and he invited me to his dorm for the obvious reason. We hung out a bit, did it, and then I said, "I should probably get going." It wasn't amazingly pleasurable but I felt giddy the whole time and it did not hurt. I got an empowering high from it, and also learned how easy it is to get laid as a woman
When I debriefed my friend on the whole thing the next day, she said, "That's kinda slu*ty." Well, maybe so, but I've been a fan of sex ever since and I think it has a good deal to do with the fact that I orchestrated my first experience and took control of my sexuality.
And not to brag, but my current boyfriend and I have mindblowingly good sex When you do it with someone you care about and they care about you, and are intent on pleasing you, I don't think you can go wrong.