Don't feel or acknowledge that I'm awake

Sorry if this is posted in the wrong section, but this has been bugging me recently. For a while now, I've felt as if I'm just going through the motions. As if i don't feel awake, the only time I feel awake is when I tell myself I am awake, otherwise I just don't feel it and coast through the day. Like there is no concious thought process on my part if i need to do something, i just automatically do it without thinking. I also have an active imagination and constantly daydream, and have done so since I was a small child. What worries me is that I am not diagnosed with having any physical illnesses/mental conditions, I appear a regular 19 year old guy who does normal things, and have enjoyed a healthy social life. What could be causing this? It is also worth noting that my imagination and this feeling do not hinder me from doing things and achieving goals, I still complete my university work and I am able to focus when necessary, but what could be causing this feeling?