Mermaid Roleplay

Your a human who wants to be a Mermaid and then you hear about these secret Mer Pins that stick to you, you go to pick one to keep (You can only choose one) There's a seahorse Pin, a Seastar Pin, a Seashell Pin, and a Coral Pin but there's a special Pin that you got a 0.1% chance on getting, because it is very sacred. Remember you only get your tail when you have the pin on and you have to be in water too. Will you be able to pick one or will it choose you? (You decide on the story you're going for)