Why does my stomach stick out ?

Em

It's has stuck out al my life and I hate it. Ever since I was like 6 I would not were a bikini and I'm now 14. I want to but I'm just to concoius. All my friend reckons I could model and shit cause they haven't seen my tummy cause I always try to hide it and it works. I dont know why it sticks out though. I'm 5"7 (173 cm) and I weigh 116 pound (53kg). PLEASE NO HATE IN THE COMMENTS X