Reflections on Writing

I have honestly never understood how the authors of memoirs think of all the little details to include in their writing.  Most of those details are made up, aren't they?  I have always prided myself on having a pretty good memory, but I don't remember the tiny little details of events in my past, maybe because I generally don't think about them much.  I am actually kind of nervous about writing a memoir, since I'm pretty sure a lot of it will end up being fictionalized because I don't remember what actually happened.  Another thing is that I don't think the things I do remember the details to would tell much of a story.  I remember weird moments and time periods in which I was obsessed over one thing or another, but honestly it's just kind of a bunch of weird things and no coherent storyline.  I don't know exactly what made me who I am today.  I wonder, do most memoir authors think about those things?  In Bad Boy Myers talks about things that changed him, and I'm really curious as to how he knew what those things were.  I don't know why I am the way I am.  I am supposed to know?  Another thing I'm worried about is including specific details.  Things like the color of the shirt I was wearing when I adopted my cat seem completely trivial to me.  The color of my shirt has nothing to do with the fact that I was in a small room completely alone except for a tiny kitten.  I honestly don't see the point of including it.  Do people actually care about the color of my shirt?  I thought that was the kind of thing nobody thought about.  Maybe that's just because I rarely pay attention to what I'm wearing, but I didn't realize that it was something I should include.  In Bad Boy the author doesn't really mention things like that.  The details were more interesting and memorable ones, like how he snuck comic books into his house hidden in his pant legs or how he bought stale candy for a dime. If I can include weird details like this, and not more mundane ones, I think I'll be able to writer a good memoir.