Since counselors were involved at the time, I think it best for you to talk to one of them about what to do now.
One thing I’d like you to think about: Although your friend was out of line to share your pictures, you have a part in your problem. You shared nude pictures. That certainly wasn’t smart. We all know that whatever we put out into the internet world can come back at us. In that sense, you set yourself up. In that sense, she didn’t single handedly “ruin your high school life”. You had a big part in it.
I wonder if you are now embarrassed and ashamed of having shared nude pictures. Maybe you are spending so much energy and stress thinking about revenge as a way to avoid dealing with your own mistake. It’s understandable. Shame and embarrassment are hard to live with. But it’s important that you take responsibility for doing something that almost inevitably would bite you.
I suggest you learn a hard lesson about internet privacy and personal boundaries. Do talk to the counselors, of course, about any legal implications if you decide to pursue your revenge scenario. I hope you’ll include my thoughts in that conversation.
If you continue to be obsessed with revenge, do make an appointment with a mental health counselor to help you deal. You would probably benefit from talking it out.
I wish you well.