Mostly everything has been said, but I just gotta add:
Living on your own, you can still eat plenty healthy.
Prepare food in bulk and then freeze in individual portions. This way you can make full meals and still be somewhat healthy. Chicken is a great example, mashed potatoes, vegetables, super easy. Pasta is cheap, but not good to eat every freakin day of the week, lol.
You would be surprised how terrible those frozen pot pies are for you
Most importantly just be responsible. It's slot easier keeping everything clean, then letting it go to shot and having to dedicate a weekend to cleaning.
Good luck and have fun bro, it opens up the next chapter of life!