Divorcing at 23, any tips or stories, really scared

I’m tired of giving him chances only to be hurt over and over again. He says creepy things, acts disturbingly like a child at times, and out of the blue, becomes angry and arrogant and hurtful. He acts like a totally different person in front of friends. Because he acts sweet at times I’ve been fooled but I’m starting to realize he gets to consciously choose whether to treat me badly, and he chooses that too often.

I’m so scared because I have no family to fall back on and Idk if my friends will still be around. I’ve shared too much of my life with this guy since I was like 16. He’a codependent and I’ve forgotten how to be alone. Any tips or stories?