Reactive Dog

Hey guys, I recently adopted my first dog about two and a half months ago from the shelter. He’s a 71 pound German shepherd mix, I think the mix part is Lab. When I first adopted him the shelter told me that he got along with every dog there except one. The first 2 days of having him he did good at the dog park at our apartment but by the third day is when he started to show his true personality. I’ve found out that he is fear based reactive and has severe separation anxiety. Ive tried to crate him with a kong while I attend my college classes but I’ve came home to a crate that is flipped upside down and the metal wires torn off the crate. I then decided to let him roam the living room but came home to trim ripped off the wall. Since I live at an apartment right outside of the college campus, everyone has dogs and it makes it really hard to go outside and relax with him. I’m constantly on the lookout for another dog so he doesn’t go over threshold and start whining, lunging, and even growling/barking. I’m exhausted by it and people who don’t understand dogs have labeled me as the guy with a bad dog. What hurts the most is he’s an amazing dog when I’m at the house and it’s just us. We sit on the couch and it’s cuddle time. I don’t think I can realistically provide the correct environment for him. I’ve tried to redirect train him but it doesn’t help when other people have reactive dogs and I’ve had an unleashed dog rush us once, which completely makes my training sessions useless. I’m currently in talks with the shelter on returning him because logically it’s not a good fit and I don’t think it’s a reasonable thing to ask a college student to pay for reactivity training and those indestructible crates are super expensive. I’m hurting because I know he has bonded with me and I feel like he’s going to deteriorate back at the shelter. I also feel like I’m going to be heavily judged by the staff for returning him. He was their longest staying resident for 2 years and he will be 3 next month. I also forgot to mention that I did take him to the vet and got him prescribed on fluoxetine and trazodone. His reactivity is still a 10/10 even on meds.