School fees and necessities

I am single mother of two kids. The father of my oldest passed away in 2006 and the father of my youngest passed away in February 2017. I am employed and my kids are in boarding school due to the remoteness of where I work. Since the father of my youngest passed, I've found it difficult to make ends meet, pay school and boarding fees, put food on the table and clothe my kids. The thought of not being able to provide for my kids breaks my heart. I am heavily in debt, which I'm trying to get out of slowly but surely, and I'm sure my situation will improve with time. I also don't have a car, which makes it difficult to pick my daughter up when she's doing sports, she plays netball and does athletics at school. I would also love to provide comfortable home for myself and my kids, instead of staying with my mom. I'm doing my best to make sure I get out of the situation I'm in right now so that I can provide a better future for myself and my kids. I know my situation is not unique, and there are probably people who are worse off than I am but I'm getting depressed and feel like I'm a failure