NakaiLovesBlubber:
yeah the me still living with my parents is the biggest reason for me not letting myself even try gaining weight to experiment, let alone just blow up
It is a personal decision of yours to make. If your family situation precludes your goals, then the solution is to seek self-sufficiency (work, save, build credit, apartment...).
Nothing good comes from complacency. I made a similar decision around your age, except it was that my BBW girlfriend at the time was not welcome by my family.
It was a decision that changed my life, hers, and my parents' ideology for the best, successful still, nearly 20 years later.