To dye, or not to dye..

okey dokey...

     my hair is to the middle of my back, and it's fine. I'm 15 years old, and i've had my hair dyed a lot in the past because i hate my natural color. It's like a light brown, but somewhat blonde, but it looks really "wishy-washy"..like it's not bold, it doesn't have any "umph!" in it, know what i mean? So, my eyebrows are liek a darker brown, so i decided to dye my hair darker so i wouldn't look like an idiot or anything. So, in the past three years i've had, light brown, dark brown, and black. I've also had red adn blonde highlights for  a while.

     A while ago i decided i was going to let my natural color grow all the way back, so that when i dyed it, red and blonde wouldn't show through. Right now about 2-3 inches of my natural color is back, it's not extremely noticiable, but it's there. I'm basically chickenning out of my idea of letting it all grow out, should i let it grow out or just dye over it, i'm thinking about just keeping it dark brown, but a rich brown.

     Oh! And also I was wondering about a procedure that takes out the previous dye you've had in your hair..does it exist? If so, is it hard on your hair? I just hate dying my hair but seeing other colors hiding in it still. I would ramble more, but the lights are flickering and its raining out...could anyone give me some advice?