You have my permission (not that you need it) to be nervous and anxious but not depressed.Depression solves nothing and you and I both know that you will definitely be doing something come July regardless of the fact that right now you don’t know what that might be.
You said before the cost of the camps you would like to attend cost to much. What about between now and July babysit/tutor in your neighborhood /help before pesach to make extra money and perhaps you can split the difference with your parents I guarantee by the time july comes around you can get between 700-thousand dollars put together(if that would be enough)additionally,some camps (at least i know some boys camps are) are now also offering partial programs so you could maybe go for two -three weeks and then have just a week or two to worry about
There are different organizations that work with families with little kids who have big sister/big brother programs. During the summer sometimes a big sister is needed perhaps you can work as a big sister it is much different then working in a day camp.
Ask a teacher that you trust she might be of help
Also might i suggest being that as you are entering your senior year you can use some of your free time to study topics that will help you for when you take the SAT so you’ll be ahead of the game