You have already been accepted to one very good university. You can do well in life starting with a degree from UT Dallas.
9 APs are a lot over all four years of high school. If I interpreted your post correctly then you took this many over just the first three years of high school.
Again this is a lot to take during junior year of high school. One daughter took AP Euro and it was a very tough course (I still remember helping her with some of the extensive reading that was needed).
To me two C’s and a B suggest that you had taken on just a bit too much. Nine APs to me also seems like a bit too much. I think that universities will see that you have challenged yourself and will take the high rigor of your classes into consideration. My suggestion is that in the future you take some care to pace yourself. Life is not a race and you do not need to do everything now, or this year. Find the right pace for you and don’t worry about whether anyone else is taking tough classes at a faster or slower pace. When you get to university make sure that you are solid on the prerequisites for any particular course before you take the course.
I know lots and lots of people who got a bachelor’s at a school ranked about the same as UT Dallas and who have since done very well in life. I have worked with many of them. I also know someone who if I understand the rankings properly got a bachelor’s degree at a school that is ranked just very slightly lower than UT Dallas, and then got some very good relevant work experience, and then got their doctorate at a very good and highly ranked program.
You are already in at one very good university. Do the best that you can this year, see how it works out and see where you end up next year.