Ender's Game Part 2 the halway point

So there are some differences from the book and the movie obviously. I noticed that the movie's "buggers" are now called formics in the book. Not sure why the change was made, honestly buggers in retrospect sounds silly. *SPOILERS* Also, in the movie, I get that they were using children as tacticians for the army's war, but ARE THEY SERIOUSLY ONLY 6 YEARS OLD?!?!? That to me blew my mind. It makes the whole situation more insane. Although now when I visualize the story I see the actors who look like pre-teens/ teens and I just can get over how the people in the book are so goddamn young! Also Ender seems to have a crappier life than I remember. Maybe it was different, but I can't say for sure, but Ender's family seems a lot more, not disjointed, but also not close. The only person aside from his comrades in the Military academy that seems to really try to interact with Ender is Valentine, which is a pretty sad existence if you ask me. To only have a single person you can really confide in. Also, Ender makes no mention of the e-mails in the book. The way the whole book is portrayed is much different from the movie in several respects so far. Motifs like love and caring relationships are really portrayed. Ender's life as a whole just seems so much more bleak. I'm not disliking the book, but it's not the greatest thin either. Probably stemming from the fact I saw the movie. *SPOILERS OVER* I'll see how the ending is, because I remember the movie having little resolution, and I'm curious to see how the book handles it.