I thought I was done with high school thinking

I'm 25 years old going on 26 and yet there are still times when I think like a kid in high school. For a few weeks now I haven't spoken to my friend Stacy. I had tried calling and emailing her during break but heard nothing from her. My first two thoughts were "is she mad at me again? or did something happen to her?" Because I know of her conditions the second thought was the one that scared me the most, but I have to admit part of me also kept thinking that she was mad at me for some reason. Well that was about 4 weeks ago, and today I finally got an answer. She finally emailed and out of respect for her I will not say why she hasn't been coming to school. I will say that she is on leave for now. I'm happy to say that she wasn't mad at me but I am sad to say that I hadn't seen or heard from her because of the second reason, I don't know exactly what happened but I'm sure she will tell me when she's ready. I have to admit I find it hilarious that as I said I'm 25 and yet at times I still think like a kid in high school. "Is she mad at me? What did I say? Why won't they tell me to my face?" Things like that still pop in my head every now and then...I'll admit I don't like when people are mad at me, especially when I know why they're mad at me, but then again I don't think many people like it when someone is mad, angry, frustrated, upset with them. In my case it makes me feel as though something is wrong with me, I begin to question whether or not I am a good friend or if there are things about me I should try to change...but of course when I start thinking about both of these things I look at the friends I have now and think "If there were something wrong with me, why would my other friends still talk to me?" Then after a while I get a headache because I can't come up with a different answer other than "I'm not a bad friend" most of the time this is all I can think of to make myself feel better, which is interesting, the fact that I need to feel as though I am a good friend, when I may not be to some people is a little disturbing to me. There are plenty of people who say they don't care what people think of them, or they don't care if someone is mad at them, I'll admit I'm in between. On one hand I do care about what people think and on the other hand I don't care; I will admit it usually will depend on the person telling me. Erikison and Freud would both say it's because of something that might have happened to me as an infant, which could be the case, it could also be because of my childhood years in grade school and the lack of friends there and the ones that I thought were friends weren't. Maybe Freud and Erikison were right about the fact that a person's infancy and childhood play a vital role in the transition from child to adult. But then again that's just me, so here are my questions to all of you why do you believe people tend to value other people's input on things? And are there times when you think like a kid in high school? And is it possible that we always have moments when we think and possibly act like kids in high school no matter how old we get?