conflicted?

I am a senior in High School, having to under go the conflicts of appling for colleges. All I no for sure is that I will be atending community college for my basics; from there im lost. My mind is constantly wondering through the stress of colleges and what my future will. what carrer will i have? will i be succesful? What should I major in? the questions haunt me all day, even in my dreams. Why is it that college stresses us out to an extent were you start second guessing what you always knew you wanted to do? :/