I have felt like that and did things that were stupid/dangerous (walk through alleys at night, alone; take rides from strange men on motorcycles, etc.). I don't think you necessarily have an illness, could just be a lack of experience with reality? I don't think/feel like that anymore but have had a lot of therapy and am nearly 60 (so have more experience with Life than I did at 20-30 when I felt that way :-)