They can control you til you're 18. And FYI, a lower back tattoo is referred to as a "tramp stamp" basically you're stuck with the stigmata of being loose for the rest of your life. Not a good idea considering how old you are now, but once you turn 18, do what you want, move out & go nuts at the tattoo/piercing parlor. Just remember, alot of decent guys find it trashy & would want nothing to do with you. So it's your decision in the end of what life you want.
And you may want to go back and use spellcheck on what you wrote for additional details. For 13 yrs old, you should know how to spell words like AND, MY, THIS, THAT, and FOREVER. Seriously, you are in 8th grade, that's junior high. You write like a second grader who failed spelling. I think you should focus more on your schoolwork then a tattoo and a piercing. Tattoos & piercings don't make you look cool. Same as smoking. It doesn't make you look cool either.