PLEASE READ AND ANSWER!!!!!!!?

im 13 to be 14 in a few days. im insecure about my weight. im 5'3 and around 130 pounds. i do have a noticable stomach and when im at the beach i just want to crawl under a rock and hide. i have to wear bikinis since my dads girlfriend helped me go swimsuit shopping and i feel as if everyones watching me even though their not. im not really pretty to top it all off and i cant put on makeup. do you have any beauty tips or any tips to help me gain confidence?