I was assaulted about 6 months ago in a bathroom. I have video of the incident. Can I press charges on the guy who attacked me. Im also a minor

You need to immediately take your evidence to the police department and file a report. Criminal charges are generally brought as the state versus the person. If they are not helpful, there is a procedure where you yourself can go to a magistrate, but the better way to prosecute is through the police and the state prosecutors