And going through another four years of college, especially a military college, is a long, tough slog. Our son roomed with a cadet who had already earned a four-year degree, and there was another in his company. Both left before affirmation because, well, they already had their degrees. I'm sure there were other reasons, too, but it was very hard for them to start over when they were already "done." You've already made your decision and have been given some good advice above but, because you will end up in four years exactly where you are now, your reasons for this repeat are going to have to be strong enough to sustain you repeatedly through some very, very tough times. Good luck to you.
(On a totally different note, and not to the OP, I find this post a head-scratcher from the perspective of USMA agreeing to invest the significant cost of four years at the academy on someone who is about to earn the identical commission from another source. I don't understand the use of taxpayer dollars here.)