Not going to college or Univeristy is not the end of the world. Not getting straight A's is also not the end of the world. Your defining moment as a person purley comes down to how you are going to react in any given situation. Your descision to follow what path will define you as a person, whether you will take an easy road or whether you will apply yourself. You will make these decsions evey day of your life. The feeling you get at the end of that path determines the joy of receiving lifes rewards.
Will going to college make your life options easier? Yep, sure will. Can you still get where you want to go without it? Yep, sure can, you just have to work a lot more harder, and I had to work really hard. A lot harder than other people who actually stayed at school and went on to Uni etc. I left home at 17, and left school about the same time. I got a job and started earning some money. I eventually got in postion that enabled me to travel around the world, a few times in fact. During all that time I was basically self educating myself. It sounds easy but I assure you it wasn't. Being a straight A student probably just meant that my efforts were not wasted. I do sometimes think it would have been nice to go on to Uni to study industrial design as was what I intended, but I look back on my life and feel totally comfortable and happy with what I have done, what I experienced, and what I have.
To reach your goals in life, will generally start with learning the skills that you require. This starts at school and could very well go on to college/uni. Without apply yourself now will only make your path harder to navigate later on. Just remember that the goal you want is always there waiting for you. :)