I was 19 when I had my very first. It was horrible. I was drunk, my boyfriend at the time was drunk, and this girl that neither of us had ever seen before burst into my room completely effed up on whatever and drunk begging for sex from me, not him. It was terrible and she ended up biting me all over and leaving bruises on me that lasted for a month. I looked like an violent assault victim.
But, in the last year I've had more and the best being with my current girlfriend (maybe I'm biased?).