One of the biggest obstacles to learning physics is the difficulty many students have in applying math to solve a problem, that is, doing word problems. If you've struggled with word problems in the past, it will be a big problem in trying to teach yourself physics.
Have you taken calculus yet? Knowing some basic calculus can help with understanding some physical concepts, but it is still possible to learn intro physics with knowledge of just algebra and trig.
I just looked at the topic list for AP Physics B, and that's a lot of material to cover. It sounds like the typical algebra-based intro physics course that lasts an academic year. I think it's doable for some people, but it'll be a lot of work. Roughly speaking, you should be going through a chapter of a typical textbook in two days.