I am an autodidact. I decided fairly early that I was going to go into electronics.
But there were no classes in electricity and electronics in 3rd grade. Even the science covered was extremely elementary (snork).
So I spent a lot of time reading books and working on building mental models. I also built projects from magazines, tearing apart broken TVs and stereos from the local appliance store for parts. It took me a while to really -get- it. That said, I do not labor under the misapprehension that I know it all. There is way too much to know all of it!
Work on it. Keep yourself interested. Read, ask questions. Stay calm, you aren't paying anyone here to teach you. Abuse a few people here, you'll find that fewer people will care to help you.
If someone says "you need to brush up on your concepts", using multiple exclamation points serves no useful purpose. Better to ask for suggestions regarding which concepts, and maybe for recommendations for websites or books. There are a lot of crap websites and Youtube videos out there. I watch a lot of basic electronics videos just to review and rate them.
As to your question, well, perhaps you might be able to jerry-rig an LM317 into something like a constant current drive for a stepper motor. But it would take some really weird circuitry, and likely still give you problems. It is designed to be a linear regulator, so it may not switch quickly enough. And as has been stated, a chopper stepper driver turns fully on and off, using the inductance of the stepper motor to store energy. An LM317 when fully on still drops about 2V across it.
So the best answer to your question is no, it won't work, don't do it. Get the right ICs, do it with circuitry designed to do the job.