Is it normal for my 41-year-old friend to go to his mother's house to take naps with her? He's
independent in all other ways: He has a career and takes care of himself. This freaks me out!
You should be freaked out. Unless his mother is actually not his mother but a long lost girlfriend, then no, this absolutely is not normal! That usually ends around age 12, or just before puberty. This is disturbing on two fronts: his desire to want to nap with his mother and her actually participating in it. I'd venture to say there's a lot more going on here than can be addressed in this column. Talk to him. Find out why he does it. If it turns out he is OK with it despite your concerns, then seriously consider that you might not have as much in common as you once thought.
Is it normal for my female friends to get mad at me because I can eat anything and not put on weight?
This sounds like jealousy to me, which is quite normal in friendships. Your friends, though, shouldn't let a fast metabolism get between them and a healthy friendship.
Is it normal for a grown woman to be obsessed with Justin Bieber?
Being obsessed with celebrity knows no bounds, age notwithstanding. Like any obsession, if it is impacting her life in a way that it interferes with things such as her relationships, career and health, then she should get help.