What colleges tend to do is look at the rigor of your HS transcript relative to what opportunities you had available. For example, if you went to a HS that had 25 different AP offerings available and you only took two of them and took mostly easy classes to keep your GPA up, that would be a negative compared to a student with the same GPA who took 8 AP classes.
But if you attended a small rural HS without much in the way of AP offerings they would not hold it against you (or so they say). Especially if you took advantage of the opportunities that you did have.
Honestly, if you are going to self-study for college level classes you are probably better off just taking actual college classes online to supplement your schedule if it needs supplementing. Then you will have actual college grades on your transcript which is something that colleges are going to be more familiar with seeing than random AP scores that are not associated with any class on your transcript. Most every state has public universities and community colleges with online offerings.
I would suggest finding some non-academic ECs that are more service or experiential to round out your portfolio. But you are only a sophomore so you have lots of time.