Navy regrets

So yesterday I signed my contract to join the Navy and I leave in exactly a year. But now that it set in I feel like I rushed into this and was pushed by the recruiter a bit. I was just so lost I graduate this coming June 2018 and couldn't figure out what to do with myself after highschool or what career and I just wanted to make my family proud since I am the last from my mother and my other two older siblings did nothing with their live and the one that was going to become a pediatrician passed away I was the last hope. Now that Ive made it my whole family is so happy and supportive except my siblings that didn't even say congrats but instead tried to down talk me. But anyway now that I am sitting down thinking I feel like I messed up. I kind of want to get out before I even get into the boot camp. Maybe I should've just waited Please someone tell me something. I feel like I have no one to turn to without being judged.