What else do I need to get admission into a good Pre-Med program

“VCU which is an in state university promised me guaranteed Medical admission.”

This is confusing. You are a junior in high school and haven’t actually applied.
Did they promise you in writing?

What where your responsibilities in this Healthcare Informatics internship at INOVA?

What does your senior year schedule look like? Are you planning to take anymore AP classes?

Have you been involved in any research program? Has your research been published?

Seconding the importance of getting into GMU Honors.
Apoly to more than a couple universities in order to have choices.
Being in the honors college means extra support and resources that are very important to Premeds.

For consideration for the GMU Honors College you must apply early action. The deadline is Nov 1st.
https://honorscollege.gmu.edu/admissions/prospective-freshman

https://honorscollege.gmu.edu/why-honors