I think it's best if you pick something that actually has meaning to you.
If I say: ying yang symbol is cool and stands for blah blah and blah, would you do it?
Just think about it for a long time, especially considering your age. It's marked on you for life, You don't want a lame ass tattoo that doesn't mean anything to you 5 years from now.
None. Find me a girl who doesn't have one
I hate ta in girl, they looks slutty and cheap after it
This would be pretty cool - link