Im afraid of my future, how do i get over it?

I'll try to explain as best as i can. i don't know why but i've been starting to fear my future for a few weeks now for numerous reasons. Im 16, i just finished 10th grade and im going on to 11th grade.I graduate high school in 3 yrs and then I go to college. I have no idea what i want to go to college for. I have no idea what career i want, ive been trying to think about it since last year but im just not sure. I feel like i wont have a career because i dont know which career suits me well. I feel like im gonna be jobless and im probably be poor and end up on the streets homeless or end up living with my parents. Another reason why im afraid is that as i get older, i will have more responsibilities and i dont know if im able to handle that. I just wish i can stay young because things are less stressful, as i grow up things become more stressful for me. There are other reasons why i fear my future but i don't want to bore you. Bottom line, im just afraid that im not gonna make it in life, something in my mind keeps telling me that i will fail in life. how do i get over my fear of the future and make myself believe that things will be ok for me in the future?