Aleksander, it sounds like you're suffering from anxiety to me. I too experience depersonalization, this sort of unreal feeling like your head's in a cloud. The racing thoughts are another tell tale symptom of anxiety. I'd talk to your doctor about possibly looking into a therapist. Later down the road, medication might also be useful, but run it by your doctor. Sometimes, we can't get rid of these things on our own. I know. I've suffered from anxiety for a year now and it's been the hardest year of my life. But I found a wonderful, supportive therapist and am taking medication. I feel worlds better than I did six months ago. Good luck to you, Aleksander.
How long have you had those symptoms? It could be depresonalization caused by anxiety.
Thats pretty normal. I'd try not to think about those deep sort of questions for a while. Get some exercise and do some work around the yard that involves physical activity so that your mind cant wander.