A rather... prickly question!
To be honest, it's not possible for a human (or any living being) to literally become a pineapple. Pineapples are a type of tropical plant that grows on a stem and has a specific biological makeup that allows it to produce fruit.
However, if you're asking in a more figurative sense, I'd interpret "being a pineapple" as embracing the qualities that pineapples are known for, such as:
1. Being sweet and welcoming: Pineapples are often associated with hospitality and warmth.
2. Having a tough exterior but a soft interior: Pineapples have a prick