I have somewhat opposite remorse, sometimes.
I came very very close to getting a tattoo when I was 18, by a good friend who has become one of the premiere tattoo artists in the country (he's inked lots of famous people, Alton Brown is the only one I can remember right now).
I didn't, for a variety of reasons, and he's become a lot better than he was at the time so that part wasn't really a bad decision per se. The point is more that I've been very seriously thinking about it for a very long time.
It's really de rigueur amongst my set -- almost everyone my age/ education level/ politics/ whathaveyou has at least one tattoo.
OR... and here's the rub... they get it right around NOW. (40 is prime time.)
And that's starting to annoy me. I kind of wish that I'd already gotten one a long time ago so I wouldn't be one of THEM, or else just continue to go tattooless. There's a guy I know who's in his late 40's and just got some knuckle tattoos and it's just, sigh, not cool at all. Trying too hard. Sours me on the whole idea.
I've always been resistant to peer pressure, and being completely tattoo-free is almost more rebellious these days (again, within my social group, not society at large) than having one.
Anyway, that said ....
Right around when I was seriously considering letting my friend give me a tattoo, one of my best friends got a huge black handprint on her shoulderblade. It was meant to look like a hole, with a zombie or something peeking through. Creepy. Expensive. And she was completely over it about five years later, and had it removed (also expensive, and not completely gone).