Is it bad that I want to be chubby?

I am currently a healthy weight and pretty average-sized, but I don't like the way I look. I would like to have a little bit of a flabby/squishy belly. I am 5 foot 6 and 150 pounds (that may sound a little chubby already but I'm actually not). I want to put on maybe 15 to 20 pounds of fat, gradually is fine so I don't look like a pig eating everything under the sun. So I want to be like 165 or 170 pounds by the middle or end of July. Yes I know that would make me a little overweight that's my goal. I want to show the world that it is possible to be beautiful and chubby at the same time, because a lot of people think it is impossible. I plan on starting to lose the weight maybe a 6 months to 2 years after. I will still exercise regularly, but I'll eat more. Not necessarily a ton of junk, but more calories, more fat grams, and bigger portions. I want to do this to help bigger girls feel more confident about themselves because all the people in my school say I'm very pretty and I'd like to prove a point that I can get a little fat and still be beautiful. I think it would also teach a lot of guys a lesson, and it would also show which guys really like me (because a lot do right now) and the ones who are just after me for looks. Do you think this is a good/bad idea? Why or why not? As I said I DO plan on losing the weight after.