What are you interested in? I would make that your first priority, to check out what you want. We all have things we don't want but that is not a very good means of motivation. I would concentrate on going to school to sample what they teach, get through the basics and then look at university or volunteering somewhere to help me learn more and decide what I want to pursue beyond that.

What stresses you about school? Figure out how to ignore that part and concentrate on what you are doing/want to do instead. Learn and work on what you like, it is your life. School can be like a game, they have you learn all this stuff so you do what you can with that but mostly you concentrate on your subjects of interest, not the grades or other stuff they are interested in. I remember before computers, registration for college was all done by hand, in a huge auditorium -- you were assigned your day to come and you took your piece of paper around to all the subjects being offered, trying to get a class in the time slot and with the professor, etc. you wanted. The popular classes filled up quickly and if you had a later day or time (say Wednesday or Thursday afternoon) as the day to register, you could find a lot of courses you wanted/needed already full and have to fall back and regroup. I found it a whole lot of fun in my warped way, timing myself to see how fast I could get through the maze each semester, LOL.