Three days ago, I went from blonde to what was supposed to be chestnut. I decided to leave it in for 45 mts. It came out WAY TOO DARK!! :( I look Gothic. My family loves it, but not me. Please help. What can I do to not look Goth?

You can strip the hair color out. That's the healtiest way to do it. Bleaching will only damage your hair... and color doesn't lift color.