It would be better if you avoid comparing yourself to others. In my experience, doing so only leads to more stress as you dwell on how others have achieved their success. Instead, focus on yourself and consider taking a part-time job to increase your income. Everyone's situation is unique, and some people are fortunate enough to begin their careers with a decent income, while others are not. Use your current job as a stepping stone towards a better career with a higher income that can provide more for you.
I agree with avoiding comparison with how others are doing but in OP's case, he is seeking for a way to be able to pay his bills with only one source of income. First of all, he won't ask such thing if what he's earning is sufficient. There is only one way which is to make changes with his expenses to compensate his bills and to at least have any amount to save. Ofcourse it would be better to seek for a side job or anything that will make his monthly earning, bigger. It would be the best solution; bigger salary means being able to pay bigger expenses. However, it is not as easy as it sounds 'coz it will depend on his circumstances. There are some instances that no matter an individual wants to add another job, his time just cannot fit another workload. Investments on the ither hand is also not simple to achieve. So I guess adjustment with expenses should be first done to make a margin and it is for later to think of how to increase his earnings.