I went through elementary school being bullied and teased. I remember someone - I can't recall his name, but I can see his face - who decided on the school bus, when I was ten or eleven, to call me "Percy. " That was somehow supposed to connect to the fact that I wasn't very athletic. I was, in fact, also not very coordinated. I was not very masculine, by the standards of ten-year-olds. I remember being on the school bus and everyone chanting, "Percy! Percy! Percy!" at me.
Yes, it has made me happier. Finishing them has made me happier. Before I wrote the Potter books, I'd never finished a novel. I came close to finishing two.