As usual, the sages of SAF have answered the call!!! Solid advice all around. I think you are coming to terms with achieving something you’ve worked very hard for. It is normal to ask if it’s the right decision and if USNA and serving will be like you think it is. That shows you really are invested in making the right choice. Decisions in the adult world all have their pros and cons. They also have the unknown. Sure, civilian colleges might sound nice now, but what if unemployment spikes when you graduate? You might be job searching for a bit. The same goes for USNA. What if the strategic power competition goes hot? We don’t know.
I’ll say this much. I am very happy I attended USNA and all my friends are too. No regrets at all. And I had my “Oh no” moment during 2/C Year. I was coming off a bad training (we didn’t do much on the training so that meant a lot of downtime to think). 2 for 7s we’re around the corner and I wasn’t in a good headspace. Was I ever seriously close to leaving? No, but I asked myself a lot if I really wanted to serve. I had another similar experience after a rough week in flight school. What I learned is that when you have a lot of time, thoughts will consume you. When you have a lot of thoughts (and maybe a negative experience to add to those thoughts), you are not in a good mental headspace to make a decision.
People don’t change overnight. You are the same person you were before you got your appointment. If it felt right before, I feel like you should try things out. Nobody has ill feelings toward someone who shows up, tries their best, but they realize it’s not for them. All the respect in the world for stepping in the arena.
On the service front, I have an absolute blast going to work every day. 2.5 years has flown by. Uncle Sam will ask you to do some really cool stuff and see some really neat places. I also can’t think of any other career path where a young 20-something can make decisions that can influence the world! That same career path will yell at you for having a rice cooker in your room

!
P.S. USNA and Plebe Summer/Plebe Year are not like the Fleet. Don’t think that all the games and getting yelled out for random stuff will be your life post graduation.