I've never seen an "8" tattoo. Do you mean an infinity one, like this link ? Cause I think it may be a bit overdone, but not to the extent of like...a tribal armband or something, haha. I think it looks pretty cool. But if you are literally referring to an 8 tattoo, then I'm pretty sure that's not overplayed, I've never saw one before lol.
20 years from now you're gonna look at pictures of yourself when you were a teenager and think, "I can't believe I wore those clothes", or "had that crazy hairstyle", etc. You're also gonna look at the tattoo plastered on your arm and think the same thing, but the difference will be that you'll be stuck with it!