Yikes. That's a problem there. I agree with the debt counselor idea. Also, see if you are eligible for any financial aid or scholarships. I understand about debt and school and the worries parents have. Just some tips to get you started.
Make a budget. Begin with what you NEED (groceries, utilities, rent, transportation, kids' clothes and bills). Try to figure out how much all that will cost and try to set that amount aside.
Don't use credit cards to pay for anything. If you don't have the cash to pay for it, then don't buy it. Credit cards will lead to interest, meaning more you'll have to pay.
Stick with school! You will never, ever break even or be able to save money while working a minimum wage job. I know. I've been there.
If necessary, use public assistance to get your kids what they need. It won't cost you anything or very much, and the public is always willing to help kids. It's obvious you love your kids, so do the best you can. Stay in school, and slug it out. You'll make it. If the pressure from your boyfriend and his family is too much, get your own place. You don't need that added pressure.
Good luck, hon. Again, you'll make it.