Get a good kitchen set and starting making your own meals. Spend two weeks where you make every meal you eat, so you break the habit of eating out. Also continue to surround yourself with fantastic people, it will keep you from getting depressed. Exercise (jogging, especially) is a very economical and beneficial pastime. Start that as soon as possible.
To add to cooking idea, challenge yourself to eat "simply" – i.e with cheap carbohydrate heavy ingredients such as rice, pasta, potatoes as a substantial portion of your calories. Use meat sparingly (it's expensive!) to make things more exciting, and always put onions, garlic and [all kinds peppers[1], zucchini, fennel (the bottom parts), herbs[2]]. All of those ingredients last in the fridge and can be "revived", or…
Considering that I've been practicing diets without any carbs for a while now, I can say that:
1. They aren't much more expensive if you plan ahead. You need to buy in bulk and refrigirate at home. 2. You do get added benefits of canceling any drinks with carbs, which means no juices and beer and much less carbonated stuff (all you can do needs to be sugar less). 3. You should feel better across the day. I always got super tired after eating rice or pasta (especially the simplest, white stuff, full grain is usually better but not much).
If you need a very good crash course on what to do, read the 4-hour body from Tim Ferriss. That's a nice starter for people trying to change their lifestyle.
BTW: Since I reduced/removed carbs from my diet I lost 10-15% of body weight, am much less tired/sleepy and can perform better mentally. I also eat less without even trying, overeating is very hard + regardless of the fact that I eat at least two eggs daily + insane quantities of fatty foods (ribs, suckling pig, bacon, butter) my bloodwork (including holesterol) improved.