First Year Teacher - Feeling Insecure

I'm totally on here for reassurance, but I am a first year chem teacher with a goldmine of a job having 3 honors periods and 2 regular sections. I student taught chem and took over for a teacher the last couple of months of last year and was loved by both groups, but I have never done first day of school and built my students up from scratch until now. Both times, student teaching and taking over for another teacher, I inherited their group of kids so there was already a class climate.

To be straightforward, I'm finding my classes are kind of ... awkward? The honors kids are good because they know each other from other honors classes and will talk, but my general periods are superrrr awkward. More so just one apathetic period. I'm not sure if I'm overthinking it. If this is how the first few weeks of school are, let me know cause I'm feeling seriously down on myself. So far, we have only done lab safety and today started the first set of notes. For lab safety, I let them work with anyone in stations and that was nice. I created a seating chart a couple days in and things got even more awkward lol. The kids don't really talk to each other?! I'll talk for 20 minutes or so and have them do practice work, vocab, etc. and they sit in silence and its uncomfortable. Maybe I'm overthinking this and silent is good, but in all my experience, usually during work time like that they will at least make casual conversation with the people around them. It's weird, tense, and I'm seriously overthinking my ability to make my class fun.

I haven't done any hardcore labs because it's only 5 days in, and I'm trying my best being a first year teacher and not knowing what units completely look like yet. My unit 1 I kinda messed up and planned mostly worksheets, but unit 1 is super boring anyway with just basic properties of matter and stuff so it's pretty dry as is. I can't change the current unit too much either since I'm still adjusting to my own schedule.

Anyway, I think I need reassurance and maybe some ideas. My class is structured for sure, but it might be boring? Maybe silent working is normal, idk. I have a mix of juniors and sophomores, so maybe it's just tense because they don't know each other very well? I feel so insecure. Is this all normal?