You need to have positive recommendations from your teachers and your GC.
Obviously, we don’t know the details of why you believe that you’re a horrible student when it comes to behavior. Is it really that bad? In any event, I would advise working very hard this year to improve any behavioral issues.
As a junior, there is still time to cultivate relationships and demonstrate real growth in this area. If possible, start communicating honestly with your GC and get their advice on how to rehab your reputation.