Veteran females help please!

I am in the army and have been for 3 years. I’m overweight and I know it. I am 20 and have a horrible knee and my male command will not help me get a profile and I can’t find a workout routine that works with how bad my knee hurts daily. I also am very overwhelmed by being in the military. It causes me anxiety daily thinking about it. And while I have had great times and friends I’m not sure what to do anymore. It is hurting my mental and physical health and I’m not sure how much longer I can handle this. I’m lost and I don’t really have many people to talk to about it. Any advice helps please!