I do know what you're going through. It was hard for me, especially because I decided on a college so far away from family and friends. I became the only one responsible for me. I looked at it as a challenge, to see if I could do it. But just because you aren't going to be a 'kid' anymore, doesn't mean that you have to change who you are. You're just a little older, and a little wiser.
As for the scholarship stuff, definitely look into them. If you have a career center (usually paired with the counseling office) they should have a ton of scholarships on file. There's also scolarships.com. Also, look over FAFSA. It's for financial aide, and it's a bit extensive.
Other then that, I'd say, try to enjoy your senior year. Do things that you wanted to do, but never got around to, or were to nervous/shy to try. Senior year is a great time to make awesome memories about high school!