I honestly felt the same, and I used to find myself in the same position that you are. But like all the other replies, it's about your mindset, don't worry or waste your time thinking about other people, it's not worth it. Only compete with the person that you were yesterday, try improving your habits and getting yourself disciplined. Other people's successes are not your losses and vice versa, you are the only person to focus on, you are the only person who knows you.