[header] How to color your hair (tweens ) [title] Use semi-permanent hair color. [step] This lasts 4-6 weeks and washes out after this time. It's sold in most pharmacies. 
Only get this if your parents are okay with it, as it still makes your hair look different. If you do go for this option, try to get your hair professionally done because it always turns out better if a pro does it.