I wish you the very best in the application process, but it is important you have a solid plan "B". As previously mentioned, the NROTC scholarship is a great option. Singapore Mom put together a list of schools that offer a room and board scholarship along with the NROTC scholarship, and many of the schools on the list are highly ranked.
When my husband and I went to CVW last fall with DD, we sat in on a panel discussion with a USNA parent and it was really helpful. If you haven't already gone to the CVW, please make sure your parents attend every and all informational sessions. Sadly, no shopping in the downtown district!
One of my DS's friends applied to USNA last year and didn't have a plan "B" (He wasn't even aware of the NROTC scholarship option!) and didn't get in. The young man struggled to find an engineering school that would accept him at the last minute and wound up going out of state (and paying out of state tuition$$$$) and also missed out on other potential scholarship money.
Don't concentrate on "Am I good enough?" But rather, spend your time being the best you can be. Work with your parents and come up with as many options as you can. Investigate all scholarships available as well. It is a DAUNTING task, I know, but you can't pin all your hopes on one option. According to what I heard at the CVW, over 15,000 students apply to the Academy each year. Even the best of the best get rejection letters, unfortunately.
By this time next year, you will be exactly where you were meant to be and you will be happy with the outcome.