All scenarios painted here are plausible. Whether they really apply to you, I can't say without seeing your move. On the other I also believe people deserve to be taken serious. Unfortunately a judo injury doesn't go away simply by imagining the injury doesn't really exist, and neither can you just do judo when you are in a lot of pain, just because you are very motivated. At the end of the day, every judoka at one point in his life gives up, all of them. Saying things like fall 7 times and get up 8 times is cliché that is not true. At the end of the day, we will all fall 8 times and get up only 7 times. All the rest are flashy one-liners.
Attitude is indeed important, but it is not everything. I know many great champions who showed great attitude, and again, until their body was so ruined that their great attitude now had them sit in a wheel chair barely able to so 1/10th of a what an average person their age could to. Macho attitude in judo isn't the key to solving every physical problem either. But, as said, all scenarios are plausible.
What I would recommend is a mixture of lessons you could draw out of the comments which you have received here. Don't be hesitant, be confident, but also don't be over-confident. Be confident in a realistic and pragmatic. Know your body. Know that a 16-year old can just start doing any exercise, while a 35-year old needs his warm-up, every stage of it, progressive, and the need for this only increases. Know your body, if the standard warmup isn't sufficient, continue your warm-up after the rest has stopped it and started other exercises. Tape things when necessary. Work towards judo, supple, smooth. Build up and dosage your training. If you're going to run a 400 m as if it were a 100 m, you'll be gassed after 160 m. You want to make through till the end of practice.
When you get injuries, take care of them, promptly, rationally. Don't dramatize them, but also don't ignore them. Judo likes to use superlatives in either direction, but simply being pragmatic and realistic may work out the best.
Also don't be too proud. If you start working out with your typical judo autist (and there are many of those in judo) who does not understand what it means to have your age, simply say "sorry, mate, I'm not up to your level, got to quit and take a breath, thanks for practice", and go catch your breath and grab a partner who can think in nuances and moderation.
Oh, and also, practice at the club that is ... "right for you". Not every club is "right for everyone". Maybe the "Stanozolol Judo Club" isn't ideal for you, but another one with a narrower entrance door might be.