Learn to Cook. Not easy just leaving home, at least it may seem that way, but once you start getting the Basics down you're set. Meat sauce for Pasta, Chilli, Chicken Cacciatore, Beef Stroganoff, and even Curried beef are all simple to make. One thing to consider about them though is that you need Spices/Herbs which are somewhat Costly. So pick some basic spices/herbs with the best bang for buck then add 1 or 2/month according to your Budgetary needs.
Basic spices/herbs to start with: Salt, Black Pepper, Oregano, Garlic Powder. With just those you can make good Meat Sauce and Chicken Cacciatore. Chilli requires Chilli Powder, with optional Cumin and Crushed Red Pepper or some kind of Hot Pepper like Cayenne, as well as some of the aforementioned Basic Spices. Curried Beef requires Curry powder, some of the Basic Spices/Herbs and the spices used in Chilli. This paragraph is mostly an example of how you can Progress your Menu by accumulating Spices gradually. One other thing that makes a big difference is Bullion, in Cube, Powder, or even Paste form. I prefer Vegetable over Beef or Poultry.
I live alone and though I like to Cook, I don't particularly like to go through the whole Process everyday. So what I usually do is make one of the previously mentioned dishes in large enough quantities to last 3-4 days and that's my main meal(supper) for the next 3 or 4 days. You can change it up daily by adding Cheese, Garlic Bread, a different vegetable, or something else.
Buy things in Bulk(ish...often called Family Size or Packs) or large sizes. Chicken Thighs, Ground Beef, Pork Chops, Rice, Potatoes. A certain amount of Patience is required to both acquiring a good selection of Spices/Herbs and other Ingredients, especially at your age, but it pays off and is worth the effort.