I have like 5.....depends what you count as one tattoo.
I have a "leg sleve" that stops at my knee cap.
i have two on the other leg.(small like 2inchs by 3 inchs)
I have one on my hip.
I have writing across my collar bone/throat.
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They are a major commitment. I got my first when i was your age (maybe a bit younger) Thinking back if i had got tattooed when i first had the desire to i would have hated the results, because i wouldnt have been able to choose something for life.
At your age its hard to think that far ahead (what am i saying im only late 21)
I love all my tattoos even though some of them represent the hard times in my life.......i can look back at them and understand what has made me what i am.
A bit of advice, dont get:
anything on your neck.
anything on your forearm/hands.
make sure you can cover up everything......unless you want to work at a construction site or music store till your 60.
I dont know what it is like in the US but tattoos in australia still have a criminal and thug ellement them. also we run off a different socal scene in the tattoo world, having all shops run by hardarse motorcycle gangs.
Really think out the design/possition, ask yourself "why am i getting it" "where will i be in 10 years" "will anyone appreciate it" "will it mean anything in a few years"
also think of size, colour and things like that.
Dont get a tattoo because they look cool.
they look stupid unless they have something behind them. I hope i dont offend anyone, but:
leave tribal stuff for people in tribes,
if you cant read chinese dont get chinese characters
see how you feel in 3 months (if the henna tattoo is still there)