HELP! I don't know what to do

Hi, currently I am a junior currently attending a high school in California. My plan is to try to get into either USC, UCSD, UCI, or UCLA and join their ROTC. What I am wondering is what are my chances of getting into these colleges and what is my chance in getting a Four-Year Scholarship from AROTC?

Weighted GPA : 3.88
Nonweighted GPA: 3.73
My current Preliminary GPA: 3.94
SAT: 1890 (Will be retaking)
PSAT:187

3 years experience in Cross Country (will be participating again in senior year)
3 years experience in Symphonic Band currently Principal Chair Trumpet (will be participating again)
1 year experience in In-Concert <-Honor Band (will be participating again)
1 year in School Musical (will be participating again)
3 years experience in Interact Club
1 Year in Jazz Band

Took 1 college class over my sophomore summer, Psychology, and received an A
Will be taking Engineering 100 over my junior summer at my local community college

AP’s taken:

AP English
AP Chemistry
AP Physics I
AP Chinese

AP’s I will be taking

AP Calc AB
AP Biology

SAT subject tests

SAT 2 - Physics I (will be taking)
SAT 2 - Chemistry (will be taking)
SAT 2 - Math II (will be taking)

2 years - Couple hundred volunteer hours from my local Mills Peninsula Hospital

What I want to major in is Mechanical Engineering.