They are, but only in the sense that you have some catching up to do. My home state's GED test is a joke, and one can self-study assuming they came close to passing 9th grade. I'll assume it's pretty similar to other states as well.
If you're thinking about going to college, the problem is that you'll probably need some remedial English/math/chem/physics coursework as a pre-med, and you'll be dropped into college level biology, history, psych etc. without the foundation high school would provide. This will take extra time for graduation but it is manageable.
That said, don't let me scare you at all. Nobody cares about your GED when you're a college student, and you should absolutely attend.
Take it light at first - like 8-12 credits.