I agee w/DnJ. I would go ahead and make some changes, even if they are little ones. You deserve to have your home looking the way that you want it to look and it's time to do something for yourself. You don't have to go "nuts" and redo the entire home, but maybe start w/your bedroom. Change the color scheme or move the furniture around and once that room is done, then you can think about changing another room, one by one.
As for asking him about dinner, the next time...allow the aroma of what you are cooking reveal itself to him. Then, if he asks about it, tell him. Sometimes, we have to just step back a wee bit and allow them to come to us. Right now, he's a teenager/roommate. If he wants to eat, he'll let you know. In fact, he may say no and then later sneak out to eat some of that delicious food that you had fixed.
Bottom line, you need to do what makes you happy. If redoing a room does it for you, then do it. Try to remember, that no matter what you do, you can't predict what his reaction will be. You have nothing to fear but fear itself.
Your journey is all about you and rediscovering you!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.