Back pain is very common and usually starts in one's 30s. You are by no means alone. I read a stat somewhere that by a certain age (I forget which) 8 out of 10 people will experience recurring back pain.
My first bout of back pain was when I was 21 and wrenched my back putting a heavy box away at work. It was treated with pain killers, muscle relaxers, and when I was still not 100% after many months, a few sessions of PT. I then had regular back pain throughout all of my pregnancies, some which was treated with PT and some that I just lived with, using heat and ice and Tylenol to get through my days, and then would get flare-ups every now and again from either over-activity or moving the wrong way.
Two years ago, I had a flare-up when I was stripping wall paper where I was barely able to walk over the weekend. It was really bad. That Monday I went to a chiropractor for the first time. I do have some disc deterioration and misalignment in my lower spine and neck but luckily, chiropractic has been able to re-open those space and give the discs room to sit properly and, hopefully, get stronger. I was feeling back to normal within 10 days and completed a triathlon 6 weeks after my injury. I wish that I had known about chiropractic 15 years earlier, with that first injury.
Anyway...I still get flare-ups every now and again and I go to the chiro for a few visits and am back to myself without steroid shots or pain killers. I also now get a massage once a month as part of my regular self care. Another big help for me has been dietary changes. I didn't really link back pain - which seemed mechanical to me - with diet. I did a detox in February and have kept most of those clean eating routines up...no gluten or grain, no dairy, no sugar or artificial sweeteners, limited alcohol and caffeine, and eating mostly veggies, meats, nuts and seeds. I had some chronic joint pain prior to the detox that disappeared...I had issues with my feet, ankles, knees, hips, shoulders, neck, and tingling and numbness in my arms and hands that went away within a week or two. Well over Easter weekend we celebrated Passover and Easter back to back. I was careful with what I ate but not careful enough and did have quite a few sugary treats...last week I had a flare up of pain that felt Iike I had injured myself but I know that I hadn't done anything. I went back on my strict detox regimen, did some yoga on Wednesday (what I could manage), and planned on seeing the chiro on Friday. Well by the end of day on Thursday, the pain was gone. Could be coincidence, but to me it was pretty strong evidence that diet can trigger inflammation and pain in the spine just like it can any other joint.
Anyway...there are lots of ways to treat chronic back pain and practice self care to prevent or minimize flare-ups. I'm 38 and am far more active than I was at 21. Lots of people our age deal with a sensitive back and still manage to stay active and healthy. Focus on the positives and know that what you're going through is really, really common and by no means a death sentence that means you'll be miserable and in pain for the rest of your life. The herniated disc is a mechanical problem that can be treated and managed. The pre-arthritis is something that diet has a HUGE role in. If you can reduce your exposure to food and substances that trigger inflammation in your body, you can go a long way towards halting the progression of arthritis and can even reverse some of that damage. There are supplements that help with this as well. Most chiropractors are well-versed in the nutritional/supplemental side of managing chronic pain and inflammation so she or he might be a good person to talk to.