You aren't alone, I just recently went back to school and was so used to seeing my balance go up that since I've been back it's jsut been depleting. While I do work part time my expenses are still more than what I earn (gas, food, rent) but there are somethings you absolutely need to have.
You have a good mentality and honestly you do need to live. Aslong as you are paying yourself first and have enough to cover your expenses you are ahead.
When I was working I tried to save atleast 60% of my after tax income to give me some wiggle room.