I was mindlessly sailing and discovering new locations until I ran into the island right behind Tortuga.
I went straight through the barrier, set a camp with a tent like I typically do and I haven't been able to leave. I can't get close enough to the barrier to even reach my boat. When I call my boat it spawns outside.
Fast Travel is completely blocked and there's nothing on the island besides food and 3 drowned enemies by Tortugas edge.
What do I do? I literally can't leave the island.