Please help, I think I'm overweight?

I'm a 13-year-old girl with a medium frame. I am 5 feet 5 inches tall, and 148 pounds. My stomach is flabby and I have 2 "jelly rolls" that are extremely squishy. When I look down I cannot see my toes. Please let me know if I am overweight or even obese, how much I need to lose, and how to get there. Thank you!