Letting go isn't easy, Amanda. It's okay.
Here's something you can do that might help. Give yourself a week, maybe two, to do this.
Get a nice piece of construction paper or cardstock, 11" x 17". Get a bunch of (cheap, used) magazines, magazines that have pictures in them that remind you of the persona you've constructed all your life. Cut out those picture, those words, anything and everything that resonates. Some of the resonances will be the things you've liked. Some of them will be things that you don't. Put the "positive" ones on one side of the cardstock. Arrange them pleasantly, a lovely bit of collage. On the other side, do the same with the "negative" ones. All the things you don't like, that's where they go, on the other side. Use a paste stick to affix everything to the cardstock.
You might arrange the collage to look like a face. Or on the other side, like a motorcycle. Or whatever. Whatever suits your fancy. Keep doing this until both sides are completely filled up. (Like, when I did this many many years ago, there were pictures of Bogart, and smoking, and Frankenstein's monster, and computers, and such. There were also picture of animals, and stained glass, some favorite movies, and words like "strong" and "stoic" and "smart.") Whatever ever it is that resonates for you, that's all that matters.
And then let us know when you're done.