In all honesty, you're completely normal. Your friends, even though they have a seemingly solid idea of what they are going to do, really don't. They will change their minds. College after highschool is in fact a great step. It's one you should probably take. But it's not a step you have to take, don't ever make that mistake.
Namely, if you are unsure about what you want to do, it's for a reason. You probably feel you have talents talored for more than one specific thing. That's just fine. Life is a lesson, a life-long lesson at that (duh). You'll find yourself eventually.
My particular path was to join the military to get my foot in the door in the way of electrical and mechanical engineering, things I have a serious passion for doing, and really get some good inside knowledge. Now that it's over, I'm also tailoring myself to another long loved activity, and that's writing. You never have to limit yourself, but you need to maintain your desires in a steady way. Do some checks and balances with yourself and your own inner-government. Discover what you like best, and what you don't. Take your time doing it, it's all up to you.
The biggest key thing many people forget about, and this goes for the general public as a whole, is that if you, individually, as a person within yourself, strive to maintain a higher level of knowledge, have an insatiable thirst for success, and more than genuinely want to succeed, but rather, have the drive to succeed, then you generally will be a success.
Time and time again, especially working right now in the insurance industry, do I see people get comfortable in their respective jobs. I see people working in the assembly part of the business (I.E.: being a paper bitch) and they do it for years. And years. And the next thing they know, they're 49 years old, they have no higher education, no higher level of knowledge, and they're making 29k per year. Because they got comfortable. I see it time and time again, and it makes me sad every time.
Always remember this when you start your career. No matter what, there is no instant key to the top. There never will be, unless you have family in the industry and they leave things to you in effort to keep it in the family. That happens, but not commonly. You're going to start from the bottom, or from a lower tier, the faster you accept that, the faster you are going to have a rewarding experience and career. Don't ever get comfortable. That's the philosophy I live by, and always will. I want more knowledge, I want to apply it to life and help myself and others. But more than just wanting these, I strive for them. It's my goal, master plan. It's written down, and it stares at me every day. It's a document on my desk, both at work and at home. It sits there every day. Corny or not, it's the application of my efforts, what I strive for. It's what I live for. I apply the rule to everything. Work, my writing, raising my puppy, Buddy, interracting with friends, learning, exercise.
It has one word on it, in nice bold print, italicized, big.
Excel