HAIR HELP

I recently dyed my hair for the first time ever I have naturally medium/light brown hair. I decided to get a balayage wanting it to be slightly lighter on the bottom. I absolutely HATE how it turned out and my parents are refusing to let me try anything to fix it. Is there any safe thing at home I can do??? How long will this bleach/highlight last?!?!?! Anything to help me from crying in my room about how ugly my hair looks.