As a fellow fucked up back person, get a coach. It'll be the smartest thing you ever do. Please learn from my mistakes. And I wouldn't necessarily agree front squats are "safer" for your back.
Caveat that this does not constitute medical advice but your back imaging isn't the worst thing in the world. I'm not saying you don't have pain or don't have a reason to have pain. The exact opposite actually. Radiographic evidence doesn't correlate with severity of pain very well at all. It just helps us determine what your treatment plan should be going forward. Nothing there jumps out as a surgical option as a necessity to me (granted this is limited information and I don't have a physical exam, history or the actual films to look at). Conservative management seems feasible. So I don't think you need to be terrified. You're not going to paralyze yourself or anything. But I do think getting a SS coach is the best possible thing you can do. I'd rank them up there with your doctor in importance.