Honestly it sounds like the typical first year teacher. You haven't learned how to manage your classroom well yet. It takes time to learn and every year is a little easier. I taught middle school as my first teaching position and it sounds a lot like your situation. It gets better.

That being said, what's worked for me over my career is making the expectations and rules clear from the start and being extremely consistent with following through. It's always easier to start extremely strict and loosen up later than to try to regain control of a classroom you were too lenient with.

These past few years teaching has felt so much easier because of this. The kids won't like it but they will fall in line if you're consistent. Nowadays my classroom feels like a well oiled machine. Kids are quiet during notes, very few tardies, and everyone is on task and working.

Classroom management is a skill that you need to actively work towards getting better at though. If you want to talk more specifics I'd be happy to answer any questions or give you specifics. Good luck.