I got into grad school, now I need to retract my commitment I got into a fully funded PhD program and accepted it. Somewhere along the line, my decision to attend grad school changed. My problem is that orientation week is in two weeks and I have not retracted my commitment.

I am afraid of what the outcome may be. My potential advisor was so nice to me and I assured her that I would be joining her lab. What should I do? I can’t just not show up... but I don’t know how to tell them that grad school is not something I want right now. I don’t want to offend anyone or ruin my academic reputation.
It's never easy to break a commitment but you have to let them know as soon as possible, the earlier the better so they can make proper preparations for themselves, perhaps even extend a last minute offer to another student. Hang in there!