Dont worry about it Akky!
Theres nothing wrong with being far away from your end goal (at least thats what I always tell myself ), how would you feel about your art if it actually came easy? not that great of an accomplishment then, huh?
I think you did a good job on that room! It's true, the light from the TV is a little odd, but even without having watched any tutorial on lighting, you could look up a reference image of a TV in a dark room, observe it and try to apply what you see
Always look for the mistakes you are making, accept them and ask yourself, what you can do to no make the same mistake in the future!