How to get skinny fast, but as healthy as possible?

Well im only 12 and i want to lose weight. I don’t wanna put how much I way and all that. Im not looking to become anorexic or anything. Just exercises and eating better. School is out so i have a lot of time for this. I can go bike riding, swimming, and play sports, etc. I want to be skinny, its summer! I want this to be a healthy process. So, any tips/plans would be great.Thanks! <3