Legs tend to float a lot

Hi guys, I'm new here. I'm a new swimmer. I'm obese. When doing a breaststroke, while inhaling the air (head sticking out of water surface), my legs tend to also float quickly rather than sink like most people. My posture makes it looks/feels like I'm doing a skydiving. I tried hard to sink my legs a little but it's tough. Does this have to do with my size? (Read somewhere about overweight/obese people tend to float more easily?) Any help would be much appreciated. Thank you :) Sent from my iPhone using Tapatalk