Not necessarily. You took all the basic required courses (4 years on English, 3 years of science, 2 years of history…) for your high school right?
Plenty of kids graduate early.
Check out this thread: Graduating Early
The only disadvantages I could see is:
- less time to boost gpa or take more ap classes compared to other applicants
- loss on the high school experience. not sure if this is important to you as you need to support your family, but I’ve heard many people say that.