What I find, maybe not difficult, but certainly irritating is that because I've chosen to remain child-free, other adults look at me like I'm still a kid, that I can't possibly understand the concepts of self-sacrifice or pride, that my experience taking care of my self &/or my husband are miniscule beside their monumental achievement of spawning offspring... Some even consider me as being selfish in some way because I haven't dedicated my life to breeding. I hear a lot of, "Oh, well, you couldn't possibly understand because you don't have kids".

Like many here, I really didn't have a childhood - I had to raise myself. My parents at least instilled me with independence & life skills before leaving me to my own ends...

But now that I am a 'grown-up' I think what I actually dislike the most is the tedium. Work, pay bills, sleep, work, pay bills, sleep. Nothing seems new or fresh, and when I have the time to explore I don't have the money, and when I have the money, I don't have the time. It gets tiresome.