I am 17 I have a dark brown hair 2 days ago I dye it golden brown color which I really hate . I can't redye it because I don't have enough money and it will damage my hair.. I really need to get my old hair :)

Unless you used a dye that washes out... in which case its going to take some time.

If you used a permanent dye... the only way without dyeing it again is to wait for it to grow out.

What type and brand of hair dye did you use. THe experts can give a better more specific answer if they knew that.

I don't really know what type or brand and I think its permanent

I say that because while I'm not an expert in this area... I know it matters a great deal exactly what kind it was. There really is substantial differences between types of hair dyes and what might be true with one... may be the worst thing you can do with another.

If you could remember the brand and type (some brands have more than one kind) it could be very helpful. With that experts could figure out the type of dye they use and give more specific answers.