Not a big fan of tattoos. My wife has a large one of a dragon on her shoulder and it really turns me off. She got it after we got married, there was little I could do. I don't think my opinion really mattered.
Beyond just not liking them, I never wanted any more identifying marks on my person than necessary. I did a lot of things at 18 I'd never do now so if you have ANY doubt, don't do it. Otherwise its your body only you can decide.