Managing one's finances is kinda hard specially if you are on a tight budget. But if your are really serious to do such, you need to seek advice, dont feel ashamed to seek support from others. Seek advice from a financial expert who will have a lot of experience dealing with problems like yours. Your financial adviser will come up with a realistic plan to help you sort out any money difficulties.
Personally I use Reddit, and if you're ever having a hard time I would recommend checking out /r/personalfinance. They seem to have helped a lot of people save more of their money and get rid of their debt quicker than a lot of people would be able to.