It's important to focus on only yourself when it comes to losing belly fat and losing weight. The minute you start comparing yourself to others, is when you will feel discouraged and frustrated by your results. There will always be someone who is skinnier, has better abs and is more ripped than you...But that plays no role in your journey to losing weight....Focus on what you need to do in order to be the healthiest version of yourself. Whether that is lifting wights, cutting out the junk food, learning about vegetables that burn fat, whatever it may be you need to focus on your fitness goals and no one else's.
Many people when they are constantly comparing themselves to friends, celebrities, family are limiting themselves and what they can achieve. In order to break out of this unhealthy cycle you must not get distracted and really zone in on your own weight loss, nutrition and diet goals. You will see much better results when you commit to finding out what works for you and sticking to it!