Tattoos might well reflect part of who we are or part of our personal stories. However, just like I do not go telling every stranger intimate secrets about myself, I do not want to share with the world, daily, what part of my life story a tattoo tells. Also, you will be judged by certain circles, merely for having a tattoo. Disregarding this at 18 is easy, but a bit harder in your 30s if you live in the corporate world and are rather happy with all that brings you.
I have three large tats, all custom drawn for me. One is a dragon and snake, intertwined, that wraps around one of my calves. My wife is a dragon in the Chinese zodiac, and I am a snake. I also have a large, very cool looking dragon, sitting on a wall sconce, on one of my thighs. I have a big Celtic knotword on one of my deltoids. The only one I semi-regret is the calf one. I should have put it around my other thigh, as it shoes when wearing shorts.
I like tats, I just think you need to think twice, and then think again, about how they might affect you in all facets of your life, for your entire life.