am i being silently fired?

i started a new availability for school which basically means i can work evenings and weekends and i’ve noticed that since i changed when i was available, my hours have decreased per week.

im a minor so i get that i have a 20 hour maximum per week but my hours keep dropping per week (think 15.50 to 14.40 to 12.50) and one week has me scheduled only on the weekend.

im fine with this (it works perfectly for my schedule) but im worried my manager is not a fan of my new schedule (which i cant help bc school) and is quietly firing me.

i also feel bad since im working less bc i feel like im inconveniencing my manager.