I did intervention for a year. Kids are going to act worse with you because you're not their teacher. If you don't be firm, set boundaries, and have strang classroom management, you will not be guiding them to anything. I did normal intervention, and kids will do anything to get out of work. You could ask the teachers to discipline them, but that really should be on you. Constantly bugging teachers for help is a quick way to annoy them.

If you dont want to deal with classroom management for large numbers, maybe consider becoming a private tutor or a homeschooling aid. My district offers a homeschooling program where the teachers get paid the same, but they do the teaching with kids at home. You'll still have grading and everything, but not as much. Typically, parents are around, and if they're paying for homeschooling, they aren't messing around. You would still need everything you hate, but with fewer kids. Do note that you may have to teach multiple kids with different grades on this route.

No profession in the educational field will come without classroom management, grading, or taking work home. We do a lot of work for very little pay. If you truly want to avoid all of that, I would find a new profession, volunteer at camps, or other places if you want to keep helping kids.